Built 2026-10-19 (19 October 2026)

Harlingen Weather Records (USC00413943)

Record envelope, standing records and threshold days for Harlingen (USC00413943), Texas, United States, with 116 years of record.

Key Facts for Harlingen

  • Harlingen (USC00413943) is a weather station in Texas, United States at 26.20 latitude and -97.67 longitude, 12 m (38 ft) above sea level.
  • The station reports from 1911 to 2026, 116 years of record.
  • 1,464 records set at Harlingen still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Harlingen tied a daily record high minimum temperature of 26.1 C (79.0 F) on 14 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Texas, United States, 26.20 latitude, -97.67 longitude.
  • Elevation: 12 m (38 ft).
  • Period of record: 1911 to 2026, 116 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

7 days at or beyond a record
Daily record high and record low at Harlingen, with 2026 drawn through them The band shows the record high and record low for each calendar day at Harlingen. The lines show the 2026 daily maximum and minimum. 7 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Harlingen. The lines show the 2026 daily maximum and minimum. 7 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Harlingen, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan33.9 C (93.0 F)-10.0 C (14.0 F)31.7 C (89.1 F)-2.8 C (27.0 F)
Feb37.2 C (99.0 F)-6.1 C (21.0 F)33.3 C (91.9 F)3.9 C (39.0 F)
Mar40.0 C (104.0 F)-1.7 C (28.9 F)35.0 C (95.0 F)9.4 C (48.9 F)
Apr41.7 C (107.1 F)2.8 C (37.0 F)33.3 C (91.9 F)12.8 C (55.0 F)
May41.7 C (107.1 F)7.8 C (46.0 F)35.0 C (95.0 F)15.6 C (60.1 F)
Jun41.1 C (106.0 F)13.9 C (57.0 F)36.7 C (98.1 F)23.3 C (73.9 F)
Jul41.7 C (107.1 F)15.6 C (60.1 F)40.0 C (104.0 F)23.3 C (73.9 F)
Aug42.2 C (108.0 F)15.6 C (60.1 F)38.9 C (102.0 F)24.4 C (75.9 F)
Sep41.1 C (106.0 F)11.1 C (52.0 F)38.3 C (100.9 F)23.3 C (73.9 F)
Oct37.8 C (100.0 F)0.6 C (33.1 F)36.1 C (97.0 F)22.2 C (72.0 F)
Nov36.1 C (97.0 F)-1.7 C (28.9 F)n/an/a
Dec33.9 C (93.0 F)-9.4 C (15.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Harlingen by the year they were set 1,464 records at Harlingen still stand. 2023 holds the most, with 48. 02040601912: 121913: 221914: 61915: 211916: 91919: 71920: 131921: 211922: 201923: 141924: 181925: 241926: 121927: 171928: 211929: 61930: 121931: 201932: 161933: 181934: 131935: 61936: 81937: 211938: 171939: 111940: 161941: 21942: 161943: 111944: 31945: 261946: 121947: 181948: 231949: 101950: 121951: 171952: 161953: 191954: 101955: 171956: 121957: 171958: 161959: 221960: 161961: 131962: 151963: 151964: 111965: 161966: 111967: 121968: 111969: 81970: 191971: 51972: 41973: 91974: 151975: 181976: 261977: 61978: 71979: 111980: 71981: 51982: 81983: 101984: 171985: 151986: 101987: 61988: 51989: 301990: 91991: 131992: 81993: 91994: 21995: 81996: 131997: 121998: 91999: 42000: 132001: 42002: 52003: 72004: 42005: 62006: 52007: 92008: 82009: 112010: 72011: 122012: 92013: 132014: 102015: 92016: 202017: 152018: 102019: 262020: 192021: 202022: 122023: 482024: 122025: 102026: 121912192619381950196219741986199820102022
1,464 records at Harlingen still stand. 2023 holds the most, with 48.
Standing records at Harlingen by the year they were set
Year setStanding records
191212
191322
19146
191521
19169
19197
192013
192121
192220
192314
192418
192524
192612
192717
192821
19296
193012
193120
193216
193318
193413
19356
19368
193721
193817
193911
194016
19412
194216
194311
19443
194526
194612
194718
194823
194910
195012
195117
195216
195319
195410
195517
195612
195717
195816
195922
196016
196113
196215
196315
196411
196516
196611
196712
196811
19698
197019
19715
19724
19739
197415
197518
197626
19776
19787
197911
19807
19815
19828
198310
198417
198515
198610
19876
19885
198930
19909
199113
19928
19939
19942
19958
199613
199712
19989
19994
200013
20014
20025
20037
20044
20056
20065
20079
20088
200911
20107
201112
20129
201313
201410
20159
201620
201715
201810
201926
202019
202120
202212
202348
202412
202510
202612

All-Time Record Progression

12 new records
When Harlingen set new all-time records 12 all-time records were set at Harlingen between 20 July 1945 and 28 March 2025. Each dot is a new record. Record high minimum temperatureRecord low minimum temperatureRecord low maximum temperatureRecord daily precipitationRecord daily snowfallRecord snow depth20 July 1945: Record high minimum temperature 30.6 C (87.1 F)31 January 1949: Record low minimum temperature -6.1 C (21.0 F)31 January 1951: Record low maximum temperature -2.2 C (28.0 F)12 January 1962: Record low minimum temperature -10.0 C (14.0 F)1 September 1975: Record daily precipitation 150.9 mm (5.9 in)30 April 1976: Record daily precipitation 201.2 mm (7.9 in)20 February 1982: Record daily precipitation 201.9 mm (7.9 in)25 December 1983: Record low maximum temperature -3.3 C (26.1 F)6 April 1991: Record daily precipitation 248.7 mm (9.8 in)25 December 2004: Record daily snowfall 3.8 cm (1.5 in)25 December 2004: Record snow depth 5.1 cm (2.0 in)28 March 2025: Record daily precipitation 254.0 mm (10.0 in)195019651980199520102025
12 all-time records were set at Harlingen between 20 July 1945 and 28 March 2025. Each dot is a new record.
When Harlingen set new all-time records
DateKindDetail
1945-07-20Record high minimum temperatureRecord high minimum temperature 30.6 C (87.1 F)
1949-01-31Record low minimum temperatureRecord low minimum temperature -6.1 C (21.0 F)
1951-01-31Record low maximum temperatureRecord low maximum temperature -2.2 C (28.0 F)
1962-01-12Record low minimum temperatureRecord low minimum temperature -10.0 C (14.0 F)
1975-09-01Record daily precipitationRecord daily precipitation 150.9 mm (5.9 in)
1976-04-30Record daily precipitationRecord daily precipitation 201.2 mm (7.9 in)
1982-02-20Record daily precipitationRecord daily precipitation 201.9 mm (7.9 in)
1983-12-25Record low maximum temperatureRecord low maximum temperature -3.3 C (26.1 F)
1991-04-06Record daily precipitationRecord daily precipitation 248.7 mm (9.8 in)
2004-12-25Record daily snowfallRecord daily snowfall 3.8 cm (1.5 in)
2004-12-25Record snow depthRecord snow depth 5.1 cm (2.0 in)
2025-03-28Record daily precipitationRecord daily precipitation 254.0 mm (10.0 in)

Wettest Day of Each Month

Mar: 254.0 mm (10.0 in)
Record daily precipitation for each month at Harlingen The wettest day on record for each calendar month at Harlingen. The most was 254.0 mm (10.0 in) on 28 March 2025. 0100200300 Jan: 84.6 mm (3.3 in), 5 January 1958 Jan Feb: 201.9 mm (7.9 in), 20 February 1982 Feb Mar: 254.0 mm (10.0 in), 28 March 2025 Mar Apr: 248.7 mm (9.8 in), 6 April 1991 Apr May: 154.7 mm (6.1 in), 1 May 1982 May Jun: 159.8 mm (6.3 in), 25 June 2019 Jun Jul: 146.6 mm (5.8 in), 24 July 2008 Jul Aug: 149.1 mm (5.9 in), 19 August 1916 Aug Sep: 150.9 mm (5.9 in), 1 September 1975 Sep Oct: 202.4 mm (8.0 in), 2 October 2021 Oct Nov: 154.4 mm (6.1 in), 23 November 2013 Nov Dec: 139.7 mm (5.5 in), 22 December 1940 Dec
The wettest day on record for each calendar month at Harlingen. The most was 254.0 mm (10.0 in) on 28 March 2025.
Record daily precipitation for each month at Harlingen
MonthRecord daily precipitation (mm)Date
Jan84.6 mm (3.3 in)5 January 1958
Feb201.9 mm (7.9 in)20 February 1982
Mar254.0 mm (10.0 in)28 March 2025
Apr248.7 mm (9.8 in)6 April 1991
May154.7 mm (6.1 in)1 May 1982
Jun159.8 mm (6.3 in)25 June 2019
Jul146.6 mm (5.8 in)24 July 2008
Aug149.1 mm (5.9 in)19 August 1916
Sep150.9 mm (5.9 in)1 September 1975
Oct202.4 mm (8.0 in)2 October 2021
Nov154.4 mm (6.1 in)23 November 2013
Dec139.7 mm (5.5 in)22 December 1940

Period of Record Coverage

1912 to 2026
Days with data per year at Harlingen 113 years of record at Harlingen, 1912 to 2026. 13 years have data for under 90 percent of days and are left out of rankings: 1912, 1916, 1919, 1971, 1972, 1987, 1991, 1994 and others. 1912: 320 of 366 days1913: 353 of 365 days1914: 351 of 365 days1915: 357 of 365 days1916: 268 of 366 days1919: 208 of 365 days1920: 349 of 366 days1921: 364 of 365 days1922: 365 of 365 days1923: 364 of 365 days1924: 365 of 366 days1925: 365 of 365 days1926: 365 of 365 days1927: 364 of 365 days1928: 366 of 366 days1929: 364 of 365 days1930: 364 of 365 days1931: 336 of 365 days1932: 366 of 366 days1933: 363 of 365 days1934: 365 of 365 days1935: 364 of 365 days1936: 365 of 366 days1937: 365 of 365 days1938: 365 of 365 days1939: 358 of 365 days1940: 358 of 366 days1941: 359 of 365 days1942: 357 of 365 days1943: 351 of 365 days1944: 356 of 366 days1945: 352 of 365 days1946: 348 of 365 days1947: 360 of 365 days1948: 365 of 366 days1949: 358 of 365 days1950: 365 of 365 days1951: 365 of 365 days1952: 362 of 366 days1953: 363 of 365 days1954: 365 of 365 days1955: 362 of 365 days1956: 335 of 366 days1957: 359 of 365 days1958: 363 of 365 days1959: 356 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 357 of 365 days1963: 365 of 365 days1964: 334 of 366 days1965: 365 of 365 days1966: 362 of 365 days1967: 359 of 365 days1968: 366 of 366 days1969: 361 of 365 days1970: 340 of 365 days1971: 137 of 365 days1972: 300 of 366 days1973: 334 of 365 days1974: 365 of 365 days1975: 335 of 365 days1976: 365 of 366 days1977: 364 of 365 days1978: 362 of 365 days1979: 355 of 365 days1980: 355 of 366 days1981: 363 of 365 days1982: 362 of 365 days1983: 334 of 365 days1984: 363 of 366 days1985: 362 of 365 days1986: 362 of 365 days1987: 328 of 365 days1988: 366 of 366 days1989: 336 of 365 days1990: 345 of 365 days1991: 320 of 365 days1992: 334 of 366 days1993: 341 of 365 days1994: 293 of 365 days1995: 355 of 365 days1996: 363 of 366 days1997: 360 of 365 days1998: 355 of 365 days1999: 361 of 365 days2000: 353 of 366 days2001: 350 of 365 days2002: 356 of 365 days2003: 359 of 365 days2004: 356 of 366 days2005: 350 of 365 days2006: 355 of 365 days2007: 353 of 365 days2008: 341 of 366 days2009: 352 of 365 days2010: 349 of 365 days2011: 351 of 365 days2012: 352 of 366 days2013: 341 of 365 days2014: 350 of 365 days2015: 345 of 365 days2016: 352 of 366 days2017: 266 of 365 days2018: 302 of 365 days2019: 317 of 365 days2020: 344 of 366 days2021: 357 of 365 days2022: 360 of 365 days2023: 342 of 365 days2024: 310 of 366 days2025: 336 of 365 days2026: 281 of 365 days19201935195019651980199520102025
113 years of record at Harlingen, 1912 to 2026. 13 years have data for under 90 percent of days and are left out of rankings: 1912, 1916, 1919, 1971, 1972, 1987, 1991, 1994 and others.
Days with data per year at Harlingen
YearDays with dataShare of yearComplete
191232087%No
191335397%Yes
191435196%Yes
191535798%Yes
191626873%No
191920857%No
192034995%Yes
1921364100%Yes
1922365100%Yes
1923364100%Yes
1924365100%Yes
1925365100%Yes
1926365100%Yes
1927364100%Yes
1928366100%Yes
1929364100%Yes
1930364100%Yes
193133692%Yes
1932366100%Yes
193336399%Yes
1934365100%Yes
1935364100%Yes
1936365100%Yes
1937365100%Yes
1938365100%Yes
193935898%Yes
194035898%Yes
194135998%Yes
194235798%Yes
194335196%Yes
194435697%Yes
194535296%Yes
194634895%Yes
194736099%Yes
1948365100%Yes
194935898%Yes
1950365100%Yes
1951365100%Yes
195236299%Yes
195336399%Yes
1954365100%Yes
195536299%Yes
195633592%Yes
195735998%Yes
195836399%Yes
195935698%Yes
1960366100%Yes
1961365100%Yes
196235798%Yes
1963365100%Yes
196433491%Yes
1965365100%Yes
196636299%Yes
196735998%Yes
1968366100%Yes
196936199%Yes
197034093%Yes
197113738%No
197230082%No
197333492%Yes
1974365100%Yes
197533592%Yes
1976365100%Yes
1977364100%Yes
197836299%Yes
197935597%Yes
198035597%Yes
198136399%Yes
198236299%Yes
198333492%Yes
198436399%Yes
198536299%Yes
198636299%Yes
198732890%No
1988366100%Yes
198933692%Yes
199034595%Yes
199132088%No
199233491%Yes
199334193%Yes
199429380%No
199535597%Yes
199636399%Yes
199736099%Yes
199835597%Yes
199936199%Yes
200035396%Yes
200135096%Yes
200235698%Yes
200335998%Yes
200435697%Yes
200535096%Yes
200635597%Yes
200735397%Yes
200834193%Yes
200935296%Yes
201034996%Yes
201135196%Yes
201235296%Yes
201334193%Yes
201435096%Yes
201534595%Yes
201635296%Yes
201726673%No
201830283%No
201931787%No
202034494%Yes
202135798%Yes
202236099%Yes
202334294%Yes
202431085%No
202533692%Yes
202628177%No

Latest Records

20
Latest records at Harlingen
DateStationRecordValueBeat old record byOld record stoodSignificance
14 October 2026Harlingen, USdaily high min (Tie, Provisional)26.1 C (79.0 F)tie8 years3 of 100 (Routine)
1 October 2026Harlingen, USmonthly high min (Tie, Provisional)27.8 C (82.0 F)tie84 years11 of 100 (Routine)
25 September 2026Harlingen, USdaily high min (Tie, Provisional)25.6 C (78.1 F)tie9 years3 of 100 (Routine)
15 September 2026Harlingen, USdaily high min (Provisional)27.2 C (81.0 F)0.5 C (0.9 F)3 years12 of 100 (Routine)
14 September 2026Harlingen, USmonthly high min (Provisional)28.9 C (84.0 F)0.6 C (1.1 F)6 years23 of 100 (Routine)
13 September 2026Harlingen, USdaily high max (Tie, Provisional)38.3 C (100.9 F)tie3 years2 of 100 (Routine)
12 September 2026Harlingen, USdaily high min (Provisional)27.8 C (82.0 F)2.8 C (5.0 F)76 years45 of 100 (Notable)
12 September 2026Harlingen, USdaily high max (Tie, Provisional)38.3 C (100.9 F)tie96 years9 of 100 (Routine)
11 September 2026Harlingen, USdaily high min (Provisional)26.1 C (79.0 F)0.5 C (0.9 F)11 years15 of 100 (Routine)
10 September 2026Harlingen, USdaily high min (Provisional)26.1 C (79.0 F)1.1 C (2.0 F)104 years44 of 100 (Notable)
9 September 2026Harlingen, USdaily high min (Tie, Provisional)26.1 C (79.0 F)tie24 years4 of 100 (Routine)
8 September 2026Harlingen, USdaily high max (Tie, Provisional)37.8 C (100.0 F)tie24 years4 of 100 (Routine)
7 September 2026Harlingen, USdaily high min (Tie, Provisional)25.6 C (78.1 F)tie56 years6 of 100 (Routine)
4 September 2026Harlingen, USdaily high min (Provisional)27.2 C (81.0 F)1.6 C (2.9 F)67 years36 of 100 (Notable)
3 September 2026Harlingen, USdaily high min (Tie, Provisional)26.7 C (80.1 F)tie5 years2 of 100 (Routine)
30 August 2026Harlingen, USdaily high min (Tie, Provisional)26.1 C (79.0 F)tie85 years8 of 100 (Routine)
22 August 2026Harlingen, USdaily high min (Tie, Provisional)26.1 C (79.0 F)tie68 years7 of 100 (Routine)
21 August 2026Harlingen, USdaily high min (Provisional)27.2 C (81.0 F)0.5 C (0.9 F)73 years35 of 100 (Notable)
20 August 2026Harlingen, USdaily high min (Tie, Provisional)26.7 C (80.1 F)tie9 years3 of 100 (Routine)
15 August 2026Harlingen, USdaily high min27.8 C (82.0 F)1.1 C (2.0 F)20 years23 of 100 (Routine)

Climate Trend

91 complete years, 1913 to 2025
Annual mean temperature at Harlingen as warming stripes, 1913 to 2025 One stripe for each of 91 complete years at Harlingen, 1913 to 2025. Blue stripes are years cooler than the station's own mean of 23.3 C (74.0 F); red stripes are warmer. The coolest year was 1976, at 20.8 C (69.5 F), and the warmest was 2023, at 25.6 C (78.1 F). The strongest colour marks a difference of 2.6 C (4.7 F). 1913: 22.5 C, -0.8 C from the station mean1914: 22.2 C, -1.1 C from the station mean1915: 22.7 C, -0.6 C from the station mean1920: 23.0 C, -0.3 C from the station mean1921: 23.9 C, +0.5 C from the station mean1922: 23.2 C, -0.1 C from the station mean1923: 22.6 C, -0.8 C from the station mean1924: 22.5 C, -0.8 C from the station mean1925: 22.9 C, -0.4 C from the station mean1926: 23.0 C, -0.3 C from the station mean1927: 24.3 C, +1.0 C from the station mean1928: 23.2 C, -0.1 C from the station mean1929: 23.6 C, +0.3 C from the station mean1930: 22.7 C, -0.6 C from the station mean1932: 23.1 C, -0.2 C from the station mean1933: 24.3 C, +0.9 C from the station mean1934: 23.4 C, +0.1 C from the station mean1935: 23.6 C, +0.3 C from the station mean1936: 22.3 C, -1.0 C from the station mean1937: 22.9 C, -0.4 C from the station mean1938: 23.8 C, +0.5 C from the station mean1939: 23.8 C, +0.5 C from the station mean1940: 23.2 C, -0.1 C from the station mean1941: 23.0 C, -0.3 C from the station mean1942: 23.6 C, +0.2 C from the station mean1943: 23.5 C, +0.2 C from the station mean1944: 23.4 C, +0.1 C from the station mean1945: 24.5 C, +1.2 C from the station mean1946: 24.3 C, +1.0 C from the station mean1947: 23.0 C, -0.3 C from the station mean1948: 23.3 C, -0.1 C from the station mean1949: 23.7 C, +0.3 C from the station mean1950: 24.6 C, +1.2 C from the station mean1951: 23.6 C, +0.3 C from the station mean1952: 23.4 C, +0.1 C from the station mean1953: 24.2 C, +0.9 C from the station mean1954: 24.0 C, +0.7 C from the station mean1955: 23.8 C, +0.4 C from the station mean1957: 24.5 C, +1.1 C from the station mean1958: 22.9 C, -0.4 C from the station mean1959: 22.8 C, -0.5 C from the station mean1960: 22.8 C, -0.5 C from the station mean1961: 22.9 C, -0.4 C from the station mean1962: 23.3 C, -0.1 C from the station mean1963: 22.3 C, -1.0 C from the station mean1965: 22.8 C, -0.5 C from the station mean1966: 21.9 C, -1.5 C from the station mean1967: 22.7 C, -0.7 C from the station mean1968: 22.0 C, -1.4 C from the station mean1969: 23.0 C, -0.4 C from the station mean1970: 22.1 C, -1.2 C from the station mean1974: 22.8 C, -0.5 C from the station mean1976: 20.8 C, -2.5 C from the station mean1977: 22.2 C, -1.1 C from the station mean1978: 22.1 C, -1.2 C from the station mean1979: 22.0 C, -1.3 C from the station mean1980: 22.8 C, -0.6 C from the station mean1981: 23.1 C, -0.2 C from the station mean1982: 23.0 C, -0.3 C from the station mean1984: 23.1 C, -0.2 C from the station mean1985: 23.0 C, -0.3 C from the station mean1986: 23.2 C, -0.1 C from the station mean1988: 22.8 C, -0.5 C from the station mean1989: 22.9 C, -0.4 C from the station mean1995: 23.2 C, -0.1 C from the station mean1996: 23.3 C, 0.0 C from the station mean1997: 22.8 C, -0.5 C from the station mean1998: 24.2 C, +0.9 C from the station mean1999: 23.9 C, +0.6 C from the station mean2000: 24.0 C, +0.6 C from the station mean2001: 23.6 C, +0.3 C from the station mean2002: 23.7 C, +0.4 C from the station mean2003: 23.4 C, +0.1 C from the station mean2004: 23.6 C, +0.3 C from the station mean2005: 24.0 C, +0.7 C from the station mean2006: 24.4 C, +1.1 C from the station mean2007: 23.2 C, -0.1 C from the station mean2008: 23.3 C, 0.0 C from the station mean2009: 23.9 C, +0.5 C from the station mean2010: 22.9 C, -0.4 C from the station mean2011: 23.9 C, +0.6 C from the station mean2012: 24.8 C, +1.4 C from the station mean2013: 23.3 C, -0.1 C from the station mean2014: 22.8 C, -0.5 C from the station mean2015: 23.3 C, -0.1 C from the station mean2016: 24.9 C, +1.6 C from the station mean2020: 25.0 C, +1.7 C from the station mean2021: 24.4 C, +1.1 C from the station mean2022: 23.8 C, +0.5 C from the station mean2023: 25.6 C, +2.3 C from the station mean2025: 24.4 C, +1.1 C from the station mean191319201930194019501960197019801990200020102020
One stripe for each of 91 complete years at Harlingen, 1913 to 2025. Blue stripes are years cooler than the station's own mean of 23.3 C (74.0 F); red stripes are warmer. The coolest year was 1976, at 20.8 C (69.5 F), and the warmest was 2023, at 25.6 C (78.1 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Harlingen as warming stripes, 1913 to 2025
YearAnnual mean temperatureDifference from the station mean
191322.5 C-0.77 C
191422.2 C-1.10 C
191522.7 C-0.63 C
192023.0 C-0.33 C
192123.9 C+0.54 C
192223.2 C-0.08 C
192322.6 C-0.75 C
192422.5 C-0.78 C
192522.9 C-0.40 C
192623.0 C-0.29 C
192724.3 C+1.01 C
192823.2 C-0.10 C
192923.6 C+0.28 C
193022.7 C-0.57 C
193223.1 C-0.19 C
193324.3 C+0.95 C
193423.4 C+0.07 C
193523.6 C+0.33 C
193622.3 C-1.03 C
193722.9 C-0.44 C
193823.8 C+0.50 C
193923.8 C+0.49 C
194023.2 C-0.09 C
194123.0 C-0.32 C
194223.6 C+0.25 C
194323.5 C+0.21 C
194423.4 C+0.13 C
194524.5 C+1.23 C
194624.3 C+0.96 C
194723.0 C-0.32 C
194823.3 C-0.06 C
194923.7 C+0.34 C
195024.6 C+1.24 C
195123.6 C+0.28 C
195223.4 C+0.09 C
195324.2 C+0.88 C
195424.0 C+0.73 C
195523.8 C+0.45 C
195724.5 C+1.15 C
195822.9 C-0.37 C
195922.8 C-0.50 C
196022.8 C-0.49 C
196122.9 C-0.38 C
196223.3 C-0.05 C
196322.3 C-1.00 C
196522.8 C-0.49 C
196621.9 C-1.45 C
196722.7 C-0.66 C
196822.0 C-1.35 C
196923.0 C-0.36 C
197022.1 C-1.24 C
197422.8 C-0.49 C
197620.8 C-2.50 C
197722.2 C-1.10 C
197822.1 C-1.24 C
197922.0 C-1.34 C
198022.8 C-0.55 C
198123.1 C-0.17 C
198223.0 C-0.31 C
198423.1 C-0.21 C
198523.0 C-0.33 C
198623.2 C-0.10 C
198822.8 C-0.49 C
198922.9 C-0.40 C
199523.2 C-0.08 C
199623.3 C-0.03 C
199722.8 C-0.53 C
199824.2 C+0.89 C
199923.9 C+0.62 C
200024.0 C+0.64 C
200123.6 C+0.26 C
200223.7 C+0.43 C
200323.4 C+0.07 C
200423.6 C+0.28 C
200524.0 C+0.69 C
200624.4 C+1.06 C
200723.2 C-0.08 C
200823.3 C+0.03 C
200923.9 C+0.54 C
201022.9 C-0.40 C
201123.9 C+0.61 C
201224.8 C+1.44 C
201323.3 C-0.06 C
201422.8 C-0.48 C
201523.3 C-0.06 C
201624.9 C+1.58 C
202025.0 C+1.69 C
202124.4 C+1.10 C
202223.8 C+0.49 C
202325.6 C+2.30 C
202524.4 C+1.10 C

The annual mean temperature here has risen by 0.07 C (0.02 to 0.12) per decade over 1913 to 2025. In Fahrenheit: 0.12 F (0.03 to 0.21) per decade. The slope is a straight line fitted to 91 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Harlingen
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.07 C (0.02 to 0.12) per decade0.12 F (0.03 to 0.21) per decade1913 to 202591Rise
Mean daily maximum-0.01 C (-0.06 to 0.05) per decade-0.02 F (-0.12 to 0.08) per decade1913 to 202591Not clearly different from zero
Mean daily minimum0.1 C (0.1 to 0.2) per decade0.3 F (0.2 to 0.3) per decade1913 to 202591Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1911 to 2026
Yearly extremes at Harlingen: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.2 C (108.0 F)191538.9 C (102.0 F)113
Coldest night (TNn)-10.0 C (14.0 F)1962-1.1 C (30.0 F)113
Wettest day (Rx1day)254.0 mm (10.0 in)202581.2 mm (3.2 in)114
Wettest five days (Rx5day)433.6 mm (17.1 in)1991122.1 mm (4.8 in)114
Longest dry spell (CDD)102 days202639 days114

Hottest day (TXx)

Hottest day (TXx) at Harlingen by year The hottest day of the year at Harlingen, 1911 to 2026. The record is 42.2 C (108.0 F) in 1915, marked on the chart; the median year is 38.9 C (102.0 F). 343638404244192019401960198020002020Record: 42.2 C (108.0 F) in 1915
The hottest day of the year at Harlingen, 1911 to 2026. The record is 42.2 C (108.0 F) in 1915, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Harlingen by year
YearHottest day (TXx)
1911n/a
191238.9 C (102.0 F)
191338.9 C (102.0 F)
191437.8 C (100.0 F)
191542.2 C (108.0 F)
191640.6 C (105.1 F)
191937.8 C (100.0 F)
192041.7 C (107.1 F)
192138.3 C (100.9 F)
192238.3 C (100.9 F)
192337.8 C (100.0 F)
192439.4 C (102.9 F)
192538.3 C (100.9 F)
192639.4 C (102.9 F)
192738.9 C (102.0 F)
192840.0 C (104.0 F)
192939.4 C (102.9 F)
193040.0 C (104.0 F)
193138.9 C (102.0 F)
193240.6 C (105.1 F)
193338.3 C (100.9 F)
193440.0 C (104.0 F)
193538.9 C (102.0 F)
193638.9 C (102.0 F)
193740.6 C (105.1 F)
193840.0 C (104.0 F)
193941.7 C (107.1 F)
194041.1 C (106.0 F)
194137.2 C (99.0 F)
194238.9 C (102.0 F)
194340.0 C (104.0 F)
194438.9 C (102.0 F)
194539.4 C (102.9 F)
194641.1 C (106.0 F)
194741.1 C (106.0 F)
194840.0 C (104.0 F)
194938.9 C (102.0 F)
195039.4 C (102.9 F)
195138.3 C (100.9 F)
195239.4 C (102.9 F)
195341.1 C (106.0 F)
195441.7 C (107.1 F)
195541.1 C (106.0 F)
195641.1 C (106.0 F)
195740.0 C (104.0 F)
195840.0 C (104.0 F)
195940.0 C (104.0 F)
196040.0 C (104.0 F)
196137.8 C (100.0 F)
196240.6 C (105.1 F)
196339.4 C (102.9 F)
196438.3 C (100.9 F)
196537.8 C (100.0 F)
196638.3 C (100.9 F)
196738.3 C (100.9 F)
196837.8 C (100.0 F)
196939.4 C (102.9 F)
197038.3 C (100.9 F)
197136.1 C (97.0 F)
197237.8 C (100.0 F)
197340.0 C (104.0 F)
197440.6 C (105.1 F)
197535.0 C (95.0 F)
197635.0 C (95.0 F)
197737.8 C (100.0 F)
197838.3 C (100.9 F)
197938.3 C (100.9 F)
198038.9 C (102.0 F)
198137.8 C (100.0 F)
198237.8 C (100.0 F)
198337.2 C (99.0 F)
198440.0 C (104.0 F)
198538.3 C (100.9 F)
198637.8 C (100.0 F)
198736.7 C (98.1 F)
198837.8 C (100.0 F)
198938.3 C (100.9 F)
199037.8 C (100.0 F)
199138.3 C (100.9 F)
199237.8 C (100.0 F)
199337.2 C (99.0 F)
199437.8 C (100.0 F)
199539.4 C (102.9 F)
199637.2 C (99.0 F)
199738.9 C (102.0 F)
199840.0 C (104.0 F)
199938.9 C (102.0 F)
200041.1 C (106.0 F)
200138.3 C (100.9 F)
200238.9 C (102.0 F)
200340.0 C (104.0 F)
200438.3 C (100.9 F)
200538.9 C (102.0 F)
200637.8 C (100.0 F)
200736.7 C (98.1 F)
200837.8 C (100.0 F)
200938.9 C (102.0 F)
201037.8 C (100.0 F)
201140.0 C (104.0 F)
201240.0 C (104.0 F)
201340.0 C (104.0 F)
201438.3 C (100.9 F)
201538.3 C (100.9 F)
201638.9 C (102.0 F)
201740.0 C (104.0 F)
201840.0 C (104.0 F)
201940.6 C (105.1 F)
202039.4 C (102.9 F)
202137.8 C (100.0 F)
202240.6 C (105.1 F)
202340.0 C (104.0 F)
202441.7 C (107.1 F)
202538.3 C (100.9 F)
202640.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Harlingen by year The coldest night of the year at Harlingen, 1911 to 2026. The record is -10.0 C (14.0 F) in 1962, marked on the chart; the median year is -1.1 C (30.0 F). -10-505192019401960198020002020Record: -10.0 C (14.0 F) in 1962
The coldest night of the year at Harlingen, 1911 to 2026. The record is -10.0 C (14.0 F) in 1962, marked on the chart; the median year is -1.1 C (30.0 F).
Coldest night (TNn) at Harlingen by year
YearColdest night (TNn)
1911n/a
1912-0.6 C (30.9 F)
1913-1.1 C (30.0 F)
1914-2.2 C (28.0 F)
1915-2.2 C (28.0 F)
1916-2.2 C (28.0 F)
1919-0.6 C (30.9 F)
1920-1.1 C (30.0 F)
19210.0 C (32.0 F)
1922-1.7 C (28.9 F)
1923-1.7 C (28.9 F)
1924-3.3 C (26.1 F)
1925-3.3 C (26.1 F)
1926-1.7 C (28.9 F)
19270.0 C (32.0 F)
1928-2.2 C (28.0 F)
1929-2.2 C (28.0 F)
1930-5.6 C (21.9 F)
19311.7 C (35.1 F)
1932-2.8 C (27.0 F)
1933-2.2 C (28.0 F)
19341.1 C (34.0 F)
1935-5.0 C (23.0 F)
1936-2.8 C (27.0 F)
19371.1 C (34.0 F)
19380.0 C (32.0 F)
19391.1 C (34.0 F)
1940-4.4 C (24.1 F)
19411.1 C (34.0 F)
19420.6 C (33.1 F)
1943-2.2 C (28.0 F)
1944-1.1 C (30.0 F)
19451.1 C (34.0 F)
19460.6 C (33.1 F)
1947-2.2 C (28.0 F)
1948-2.2 C (28.0 F)
1949-6.1 C (21.0 F)
1950-2.2 C (28.0 F)
1951-6.1 C (21.0 F)
19522.2 C (36.0 F)
1953-2.2 C (28.0 F)
19540.6 C (33.1 F)
1955-2.2 C (28.0 F)
19560.6 C (33.1 F)
1957-2.2 C (28.0 F)
1958-1.7 C (28.9 F)
1959-1.1 C (30.0 F)
1960-1.1 C (30.0 F)
19610.6 C (33.1 F)
1962-10.0 C (14.0 F)
1963-5.6 C (21.9 F)
1964-1.1 C (30.0 F)
19650.0 C (32.0 F)
1966-3.3 C (26.1 F)
1967-1.7 C (28.9 F)
1968-1.1 C (30.0 F)
1969-1.7 C (28.9 F)
1970-2.8 C (27.0 F)
1971-0.6 C (30.9 F)
19721.1 C (34.0 F)
1973-3.9 C (25.0 F)
19740.0 C (32.0 F)
1975-4.4 C (24.1 F)
1976-2.2 C (28.0 F)
1977-1.7 C (28.9 F)
1978-1.1 C (30.0 F)
1979-5.0 C (23.0 F)
1980-1.7 C (28.9 F)
1981-0.6 C (30.9 F)
1982-3.3 C (26.1 F)
1983-7.2 C (19.0 F)
1984-1.1 C (30.0 F)
1985-3.3 C (26.1 F)
19862.2 C (36.0 F)
19872.2 C (36.0 F)
19880.6 C (33.1 F)
1989-9.4 C (15.1 F)
1990-2.2 C (28.0 F)
19913.3 C (37.9 F)
19922.2 C (36.0 F)
19930.6 C (33.1 F)
19942.8 C (37.0 F)
19953.9 C (39.0 F)
1996-2.2 C (28.0 F)
1997-1.1 C (30.0 F)
19981.1 C (34.0 F)
19991.7 C (35.1 F)
20001.1 C (34.0 F)
20010.6 C (33.1 F)
20022.8 C (37.0 F)
20031.1 C (34.0 F)
2004-2.8 C (27.0 F)
20051.7 C (35.1 F)
20062.2 C (36.0 F)
20071.1 C (34.0 F)
20082.2 C (36.0 F)
2009-0.6 C (30.9 F)
2010-3.3 C (26.1 F)
2011-2.8 C (27.0 F)
20122.2 C (36.0 F)
20131.7 C (35.1 F)
2014-0.6 C (30.9 F)
20151.7 C (35.1 F)
20162.2 C (36.0 F)
2017-1.7 C (28.9 F)
2018-1.1 C (30.0 F)
20193.3 C (37.9 F)
20201.7 C (35.1 F)
2021-5.0 C (23.0 F)
2022-2.2 C (28.0 F)
20232.8 C (37.0 F)
2024-2.2 C (28.0 F)
2025-2.8 C (27.0 F)
2026-2.8 C (27.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Harlingen by year The wettest day of the year at Harlingen, 1911 to 2026. The record is 254.0 mm (10.0 in) in 2025, marked on the chart; the median year is 81.2 mm (3.2 in). 0100200300192019401960198020002020Record: 254.0 mm (10.0 in) in 2025
The wettest day of the year at Harlingen, 1911 to 2026. The record is 254.0 mm (10.0 in) in 2025, marked on the chart; the median year is 81.2 mm (3.2 in).
Wettest day (Rx1day) at Harlingen by year
YearWettest day (Rx1day)
191123.6 mm (0.9 in)
191257.2 mm (2.3 in)
1913115.1 mm (4.5 in)
191465.3 mm (2.6 in)
191549.0 mm (1.9 in)
1916149.1 mm (5.9 in)
191951.8 mm (2.0 in)
192041.1 mm (1.6 in)
192154.4 mm (2.1 in)
192275.7 mm (3.0 in)
1923131.1 mm (5.2 in)
192480.5 mm (3.2 in)
192598.6 mm (3.9 in)
192656.6 mm (2.2 in)
192758.9 mm (2.3 in)
192888.9 mm (3.5 in)
1929129.5 mm (5.1 in)
193063.5 mm (2.5 in)
193195.3 mm (3.8 in)
193281.3 mm (3.2 in)
193376.2 mm (3.0 in)
193445.7 mm (1.8 in)
1935127.0 mm (5.0 in)
1936141.0 mm (5.6 in)
193755.9 mm (2.2 in)
1938127.0 mm (5.0 in)
1939127.3 mm (5.0 in)
1940139.7 mm (5.5 in)
1941108.0 mm (4.3 in)
194288.9 mm (3.5 in)
1943109.2 mm (4.3 in)
1944111.8 mm (4.4 in)
194588.9 mm (3.5 in)
194677.5 mm (3.1 in)
194766.8 mm (2.6 in)
1948129.5 mm (5.1 in)
194949.5 mm (1.9 in)
195088.9 mm (3.5 in)
195173.2 mm (2.9 in)
195259.7 mm (2.4 in)
195395.3 mm (3.8 in)
195455.6 mm (2.2 in)
195585.1 mm (3.4 in)
195633.0 mm (1.3 in)
195773.4 mm (2.9 in)
195885.9 mm (3.4 in)
195992.7 mm (3.6 in)
196083.3 mm (3.3 in)
196191.7 mm (3.6 in)
196247.2 mm (1.9 in)
196363.2 mm (2.5 in)
196465.0 mm (2.6 in)
196538.1 mm (1.5 in)
196677.5 mm (3.1 in)
1967122.2 mm (4.8 in)
196866.3 mm (2.6 in)
196986.4 mm (3.4 in)
1970106.7 mm (4.2 in)
197132.0 mm (1.3 in)
197272.6 mm (2.9 in)
197399.6 mm (3.9 in)
1974130.3 mm (5.1 in)
1975150.9 mm (5.9 in)
1976201.2 mm (7.9 in)
197771.9 mm (2.8 in)
197859.9 mm (2.4 in)
197968.8 mm (2.7 in)
1980146.6 mm (5.8 in)
198155.1 mm (2.2 in)
1982201.9 mm (7.9 in)
1983125.2 mm (4.9 in)
1984128.3 mm (5.1 in)
198563.8 mm (2.5 in)
198676.7 mm (3.0 in)
198783.8 mm (3.3 in)
1988108.0 mm (4.3 in)
198950.0 mm (2.0 in)
199044.5 mm (1.8 in)
1991248.7 mm (9.8 in)
1992103.6 mm (4.1 in)
199382.0 mm (3.2 in)
199463.5 mm (2.5 in)
199548.0 mm (1.9 in)
199671.6 mm (2.8 in)
199795.8 mm (3.8 in)
1998118.4 mm (4.7 in)
199957.4 mm (2.3 in)
200085.1 mm (3.4 in)
200175.4 mm (3.0 in)
200281.0 mm (3.2 in)
2003103.1 mm (4.1 in)
200487.9 mm (3.5 in)
200546.7 mm (1.8 in)
200667.1 mm (2.6 in)
2007131.6 mm (5.2 in)
2008146.6 mm (5.8 in)
200959.9 mm (2.4 in)
2010133.4 mm (5.3 in)
2011110.0 mm (4.3 in)
201237.8 mm (1.5 in)
2013154.4 mm (6.1 in)
201445.0 mm (1.8 in)
201566.8 mm (2.6 in)
201647.5 mm (1.9 in)
201740.1 mm (1.6 in)
2018149.6 mm (5.9 in)
2019159.8 mm (6.3 in)
202061.2 mm (2.4 in)
2021202.4 mm (8.0 in)
2022103.6 mm (4.1 in)
202367.3 mm (2.6 in)
202467.1 mm (2.6 in)
2025254.0 mm (10.0 in)
202650.8 mm (2.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Harlingen by year The wettest five days of the year at Harlingen, 1911 to 2026. The record is 433.6 mm (17.1 in) in 1991, marked on the chart; the median year is 122.1 mm (4.8 in). 0200400600192019401960198020002020Record: 433.6 mm (17.1 in) in 1991
The wettest five days of the year at Harlingen, 1911 to 2026. The record is 433.6 mm (17.1 in) in 1991, marked on the chart; the median year is 122.1 mm (4.8 in).
Wettest five days (Rx5day) at Harlingen by year
YearWettest five days (Rx5day)
191129.5 mm (1.2 in)
191293.3 mm (3.7 in)
1913146.1 mm (5.8 in)
191475.0 mm (3.0 in)
191587.6 mm (3.4 in)
1916152.6 mm (6.0 in)
191998.6 mm (3.9 in)
192041.1 mm (1.6 in)
192172.8 mm (2.9 in)
1922200.7 mm (7.9 in)
1923205.2 mm (8.1 in)
192496.7 mm (3.8 in)
1925144.3 mm (5.7 in)
192679.4 mm (3.1 in)
192781.5 mm (3.2 in)
1928119.4 mm (4.7 in)
1929150.6 mm (5.9 in)
1930108.0 mm (4.3 in)
1931108.0 mm (4.3 in)
193297.7 mm (3.8 in)
1933145.1 mm (5.7 in)
193483.8 mm (3.3 in)
1935161.3 mm (6.4 in)
1936184.9 mm (7.3 in)
1937119.4 mm (4.7 in)
1938152.4 mm (6.0 in)
1939175.3 mm (6.9 in)
1940196.8 mm (7.7 in)
1941143.6 mm (5.7 in)
1942143.5 mm (5.6 in)
1943170.2 mm (6.7 in)
1944155.8 mm (6.1 in)
1945142.2 mm (5.6 in)
1946116.9 mm (4.6 in)
1947154.7 mm (6.1 in)
1948129.8 mm (5.1 in)
194967.6 mm (2.7 in)
1950103.4 mm (4.1 in)
1951144.5 mm (5.7 in)
195291.1 mm (3.6 in)
1953234.6 mm (9.2 in)
195496.3 mm (3.8 in)
1955136.9 mm (5.4 in)
195633.3 mm (1.3 in)
1957102.6 mm (4.0 in)
1958162.4 mm (6.4 in)
1959136.6 mm (5.4 in)
1960125.4 mm (4.9 in)
1961203.5 mm (8.0 in)
196256.7 mm (2.2 in)
1963113.8 mm (4.5 in)
196465.0 mm (2.6 in)
196587.8 mm (3.5 in)
1966188.8 mm (7.4 in)
1967279.0 mm (11.0 in)
1968118.4 mm (4.7 in)
196999.3 mm (3.9 in)
1970135.9 mm (5.4 in)
197132.0 mm (1.3 in)
197294.2 mm (3.7 in)
1973115.1 mm (4.5 in)
1974200.9 mm (7.9 in)
1975170.8 mm (6.7 in)
1976201.7 mm (7.9 in)
1977106.4 mm (4.2 in)
1978109.5 mm (4.3 in)
1979110.2 mm (4.3 in)
1980212.7 mm (8.4 in)
198182.0 mm (3.2 in)
1982204.2 mm (8.0 in)
1983168.6 mm (6.6 in)
1984288.8 mm (11.4 in)
198568.9 mm (2.7 in)
1986136.6 mm (5.4 in)
1987130.3 mm (5.1 in)
1988124.8 mm (4.9 in)
198966.8 mm (2.6 in)
199052.9 mm (2.1 in)
1991433.6 mm (17.1 in)
1992142.4 mm (5.6 in)
1993109.0 mm (4.3 in)
199474.5 mm (2.9 in)
1995110.5 mm (4.4 in)
1996153.4 mm (6.0 in)
1997162.7 mm (6.4 in)
1998211.3 mm (8.3 in)
199993.3 mm (3.7 in)
2000107.0 mm (4.2 in)
2001100.3 mm (3.9 in)
2002146.9 mm (5.8 in)
2003153.4 mm (6.0 in)
2004129.4 mm (5.1 in)
200580.3 mm (3.2 in)
200675.4 mm (3.0 in)
2007204.2 mm (8.0 in)
2008212.9 mm (8.4 in)
200972.3 mm (2.8 in)
2010167.4 mm (6.6 in)
2011124.7 mm (4.9 in)
201278.2 mm (3.1 in)
2013180.1 mm (7.1 in)
201491.3 mm (3.6 in)
2015142.3 mm (5.6 in)
201689.4 mm (3.5 in)
201749.0 mm (1.9 in)
2018370.6 mm (14.6 in)
2019161.4 mm (6.4 in)
202096.3 mm (3.8 in)
2021207.3 mm (8.2 in)
2022118.1 mm (4.6 in)
2023106.8 mm (4.2 in)
2024113.9 mm (4.5 in)
2025385.6 mm (15.2 in)
2026104.0 mm (4.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Harlingen by year The longest dry spell of the year at Harlingen, 1911 to 2026. The record is 102 days in 2026, marked on the chart; the median year is 39 days. 0255075100125192019401960198020002020Record: 102 days in 2026
The longest dry spell of the year at Harlingen, 1911 to 2026. The record is 102 days in 2026, marked on the chart; the median year is 39 days.
Longest dry spell (CDD) at Harlingen by year
YearLongest dry spell (CDD)
191148 days
191239 days
191337 days
191438 days
191529 days
191654 days
191928 days
192060 days
192134 days
192229 days
192333 days
192447 days
192545 days
192627 days
192734 days
192859 days
192946 days
193033 days
193140 days
193246 days
193358 days
193449 days
193530 days
193636 days
193734 days
193851 days
193946 days
194045 days
194127 days
194246 days
194362 days
194452 days
194547 days
194640 days
194738 days
194836 days
194923 days
195047 days
195128 days
195242 days
195337 days
195438 days
195542 days
195644 days
195748 days
195846 days
195937 days
196021 days
196144 days
196251 days
196345 days
196434 days
196539 days
196638 days
196733 days
196823 days
196933 days
197041 days
197136 days
197222 days
197328 days
197445 days
197533 days
197634 days
197741 days
197853 days
197940 days
198040 days
198142 days
198257 days
198339 days
198432 days
198549 days
198642 days
198728 days
198827 days
198963 days
199037 days
199123 days
199228 days
199331 days
199426 days
199554 days
199639 days
199761 days
199876 days
199943 days
200039 days
200129 days
200240 days
200343 days
200422 days
200546 days
200631 days
200740 days
200836 days
200961 days
201060 days
201140 days
201234 days
201326 days
201427 days
201518 days
201641 days
201722 days
201820 days
201915 days
202026 days
202134 days
202241 days
202339 days
202426 days
202525 days
2026102 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

25 years with a frost

Across 25 years with a frost, the median last spring frost at Harlingen falls on 3 February and the median first autumn frost on 14 December, which leaves a median of 314 days between them.

Fitted over all years, the growing season changes by +1.2 days per decade at this station.

Frost dates and growing season at Harlingen
MeasureMedian, all yearsEarliest periodRecent period (1914 to 2022)Recent against earliestFitted trend
Last spring frost3 Februaryn/a3 Februaryn/a-1.3 days per decade
First autumn frost14 Decembern/a14 Decembern/a-0.1 days per decade
Growing days314 daysn/a314 daysn/a+1.2 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

102 years, 1912 to 2025

A day with at least 82.3 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 226.1 mm (8.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Harlingen: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years82.3 mm (3.2 in)
5 years116.7 mm (4.6 in)
10 years141.0 mm (5.6 in)
25 years173.6 mm (6.8 in)
50 years199.3 mm (7.8 in)
100 years226.1 mm (8.9 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 102 years of values from 1912 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 254.0 mm (10.0 in) in 2025; 202.4 mm (8.0 in) in 2021; 201.9 mm (7.9 in) in 1982.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2007 to 2025 against 1961 to 1990

Over 2007 to 2025, Harlingen had a mean temperature of 24.0 C (75.1 F) and 681.5 mm (26.8 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are El Barretal I (Mexico, 277 km away), El Pilon (Mexico, 261 km away) and Jimenez (Mexico, 237 km away).

Climate twins of Harlingen: stations whose 1961 to 1990 climate is closest to its 2007 to 2025 climate
Twin stationCountryDistance awayMean temperature, 1961-1990Rain a year, 1961-1990Climate difference
El Barretal IMexico277 km (172 mi)24.0 C (75.3 F)713.7 mm (28.1 in)0.75
El PilonMexico261 km (162 mi)24.3 C (75.7 F)665.8 mm (26.2 in)0.80
JimenezMexico237 km (147 mi)24.1 C (75.4 F)646.4 mm (25.4 in)0.84

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

  • Data for Harlingen standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Harlingen threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-17).