Daily records
Page built 2026-10-19
Data as of 2025-12-31
Search
Built 2026-10-19 (19 October 2026)

Ascencion (Smn) Weather Records (MXN00008001)

Record envelope, standing records and threshold days for Ascencion (Smn) (MXN00008001), Mexico, with 101 years of record.

Key Facts for Ascencion (Smn)

  • Ascencion (Smn) (MXN00008001) is a weather station in Mexico at 31.08 latitude and -107.98 longitude, 1,300 m (4,265 ft) above sea level.
  • The station reports from 1903 to 2003, 101 years of record.
  • 1,464 records set at Ascencion (Smn) still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Ascencion (Smn) set a daily record high maximum temperature of 27.8 C (82.0 F) on 27 December 2003.

About the Station

  • Location: Mexico, 31.08 latitude, -107.98 longitude.
  • Elevation: 1,300 m (4,265 ft).
  • Period of record: 1903 to 2003, 101 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Ascencion (Smn), with 2026 drawn through them The band shows the record high and record low for each calendar day at Ascencion (Smn). The lines show the 2026 daily maximum and minimum. 0 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 Ascencion (Smn). The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Ascencion (Smn), with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan35.6 C (96.1 F)-20.0 C (-4.0 F)n/an/a
Feb38.9 C (102.0 F)-17.2 C (1.0 F)n/an/a
Mar37.8 C (100.0 F)-9.4 C (15.1 F)n/an/a
Apr43.9 C (111.0 F)-8.9 C (16.0 F)n/an/a
May48.9 C (120.0 F)-2.8 C (27.0 F)n/an/a
Jun50.0 C (122.0 F)0.0 C (32.0 F)n/an/a
Jul50.0 C (122.0 F)1.7 C (35.1 F)n/an/a
Aug50.0 C (122.0 F)2.8 C (37.0 F)n/an/a
Sep50.0 C (122.0 F)0.0 C (32.0 F)n/an/a
Oct43.9 C (111.0 F)-6.1 C (21.0 F)n/an/a
Nov45.6 C (114.1 F)-15.0 C (5.0 F)n/an/a
Dec40.0 C (104.0 F)-20.0 C (-4.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Ascencion (Smn) by the year they were set 1,464 records at Ascencion (Smn) still stand. 1994 holds the most, with 189. 0501001502001903: 101904: 241905: 91906: 231907: 241908: 141909: 121910: 251911: 91967: 301968: 281969: 251970: 281971: 231972: 231973: 911974: 331975: 141976: 271977: 431978: 251979: 291980: 241981: 181982: 181985: 121986: 211987: 241988: 141989: 221990: 221991: 141992: 131993: 691994: 1891995: 1821996: 1111997: 161998: 71999: 212003: 98190319081968197319781985199019952003
1,464 records at Ascencion (Smn) still stand. 1994 holds the most, with 189.
Standing records at Ascencion (Smn) by the year they were set
Year setStanding records
190310
190424
19059
190623
190724
190814
190912
191025
19119
196730
196828
196925
197028
197123
197223
197391
197433
197514
197627
197743
197825
197929
198024
198118
198218
198512
198621
198724
198814
198922
199022
199114
199213
199369
1994189
1995182
1996111
199716
19987
199921
200398

Wettest Day of Each Month

Sep: 89.9 mm (3.5 in)
Record daily precipitation for each month at Ascencion (Smn) The wettest day on record for each calendar month at Ascencion (Smn). The most was 89.9 mm (3.5 in) on 14 September 1949. 0255075100 Jan: 30.0 mm (1.2 in), 5 January 1949 Jan Feb: 32.8 mm (1.3 in), 5 February 1997 Feb Mar: 24.9 mm (1.0 in), 20 March 2003 Mar Apr: 15.7 mm (0.6 in), 26 April 1985 Apr May: 24.9 mm (1.0 in), 4 May 1973 May Jun: 19.8 mm (0.8 in), 2 June 1952 Jun Jul: 59.9 mm (2.4 in), 29 July 1953 Jul Aug: 87.4 mm (3.4 in), 10 August 1909 Aug Sep: 89.9 mm (3.5 in), 14 September 1949 Sep Oct: 71.9 mm (2.8 in), 2 October 1950 Oct Nov: 27.9 mm (1.1 in), 10 November 1997 Nov Dec: 29.0 mm (1.1 in), 1 December 1982 Dec
The wettest day on record for each calendar month at Ascencion (Smn). The most was 89.9 mm (3.5 in) on 14 September 1949.
Record daily precipitation for each month at Ascencion (Smn)
MonthRecord daily precipitation (mm)Date
Jan30.0 mm (1.2 in)5 January 1949
Feb32.8 mm (1.3 in)5 February 1997
Mar24.9 mm (1.0 in)20 March 2003
Apr15.7 mm (0.6 in)26 April 1985
May24.9 mm (1.0 in)4 May 1973
Jun19.8 mm (0.8 in)2 June 1952
Jul59.9 mm (2.4 in)29 July 1953
Aug87.4 mm (3.4 in)10 August 1909
Sep89.9 mm (3.5 in)14 September 1949
Oct71.9 mm (2.8 in)2 October 1950
Nov27.9 mm (1.1 in)10 November 1997
Dec29.0 mm (1.1 in)1 December 1982

Period of Record Coverage

1963 to 2003
Days with data per year at Ascencion (Smn) 34 years of record at Ascencion (Smn), 1963 to 2003. 10 years have data for under 90 percent of days and are left out of rankings: 1963, 1975, 1981, 1982, 1983, 1985, 1987, 1994 and others. 1963: 31 of 365 days1967: 337 of 365 days1968: 366 of 366 days1969: 362 of 365 days1970: 361 of 365 days1971: 364 of 365 days1972: 366 of 366 days1973: 364 of 365 days1974: 362 of 365 days1975: 246 of 365 days1976: 364 of 366 days1977: 363 of 365 days1978: 364 of 365 days1979: 361 of 365 days1980: 363 of 366 days1981: 303 of 365 days1982: 275 of 365 days1983: 37 of 365 days1985: 244 of 365 days1986: 365 of 365 days1987: 314 of 365 days1988: 335 of 366 days1989: 365 of 365 days1990: 363 of 365 days1991: 365 of 365 days1992: 366 of 366 days1993: 347 of 365 days1994: 300 of 365 days1995: 315 of 365 days1996: 354 of 366 days1997: 346 of 365 days1998: 235 of 365 days1999: 354 of 365 days2003: 357 of 365 days197019751980198519901995
34 years of record at Ascencion (Smn), 1963 to 2003. 10 years have data for under 90 percent of days and are left out of rankings: 1963, 1975, 1981, 1982, 1983, 1985, 1987, 1994 and others.
Days with data per year at Ascencion (Smn)
YearDays with dataShare of yearComplete
1963318%No
196733792%Yes
1968366100%Yes
196936299%Yes
197036199%Yes
1971364100%Yes
1972366100%Yes
1973364100%Yes
197436299%Yes
197524667%No
197636499%Yes
197736399%Yes
1978364100%Yes
197936199%Yes
198036399%Yes
198130383%No
198227575%No
19833710%No
198524467%No
1986365100%Yes
198731486%No
198833592%Yes
1989365100%Yes
199036399%Yes
1991365100%Yes
1992366100%Yes
199334795%Yes
199430082%No
199531586%No
199635497%Yes
199734695%Yes
199823564%No
199935497%Yes
200335798%Yes

Latest Records

20
Latest records at Ascencion (Smn)
DateStationRecordValueBeat old record byOld record stoodSignificance
27 December 2003Ascencion (Smn), MXdaily high max27.8 C (82.0 F)2.2 C (4.0 F)9 years9 of 100 (Routine)
26 December 2003Ascencion (Smn), MXdaily high min17.8 C (64.0 F)3.9 C (7.0 F)9 years18 of 100 (Routine)
23 December 2003Ascencion (Smn), MXdaily high min (Tie)15.0 C (59.0 F)tie9 years3 of 100 (Routine)
22 December 2003Ascencion (Smn), MXdaily high min15.0 C (59.0 F)1.1 C (2.0 F)9 years13 of 100 (Routine)
20 December 2003Ascencion (Smn), MXdaily high min (Tie)11.7 C (53.1 F)tie9 years3 of 100 (Routine)
19 December 2003Ascencion (Smn), MXdaily high max27.8 C (82.0 F)1.1 C (2.0 F)8 years7 of 100 (Routine)
18 December 2003Ascencion (Smn), MXdaily high max30.0 C (86.0 F)3.3 C (5.9 F)8 years11 of 100 (Routine)
16 December 2003Ascencion (Smn), MXdaily high min18.9 C (66.0 F)3.9 C (7.0 F)9 years18 of 100 (Routine)
16 December 2003Ascencion (Smn), MXdaily high max31.7 C (89.1 F)1.7 C (3.1 F)8 years8 of 100 (Routine)
14 December 2003Ascencion (Smn), MXdaily high min18.9 C (66.0 F)3.9 C (7.0 F)9 years18 of 100 (Routine)
13 December 2003Ascencion (Smn), MXdaily high max32.8 C (91.0 F)2.8 C (5.0 F)8 years10 of 100 (Routine)
12 December 2003Ascencion (Smn), MXdaily high min15.0 C (59.0 F)3.3 C (5.9 F)8 years17 of 100 (Routine)
11 December 2003Ascencion (Smn), MXdaily high min20.6 C (69.1 F)8.9 C (16.0 F)9 years27 of 100 (Routine)
10 December 2003Ascencion (Smn), MXmonthly high min21.7 C (71.1 F)1.1 C (2.0 F)0 years21 of 100 (Routine)
9 December 2003Ascencion (Smn), MXdaily high min15.0 C (59.0 F)3.3 C (5.9 F)9 years17 of 100 (Routine)
8 December 2003Ascencion (Smn), MXmonthly high min20.6 C (69.1 F)2.8 C (5.0 F)10 years27 of 100 (Routine)
7 December 2003Ascencion (Smn), MXdaily high min11.7 C (53.1 F)1.7 C (3.1 F)9 years14 of 100 (Routine)
7 December 2003Ascencion (Smn), MXdaily high max32.8 C (91.0 F)1.1 C (2.0 F)9 years7 of 100 (Routine)
6 December 2003Ascencion (Smn), MXdaily high min15.0 C (59.0 F)3.3 C (5.9 F)9 years17 of 100 (Routine)
6 December 2003Ascencion (Smn), MXdaily high max33.9 C (93.0 F)3.9 C (7.0 F)9 years12 of 100 (Routine)

Climate Trend

20 complete years, 1968 to 2003
Annual mean temperature at Ascencion (Smn) as warming stripes, 1968 to 2003 One stripe for each of 20 complete years at Ascencion (Smn), 1968 to 2003. Blue stripes are years cooler than the station's own mean of 16.3 C (61.4 F); red stripes are warmer. The coolest year was 1973, at 13.0 C (55.5 F), and the warmest was 1996, at 19.7 C (67.5 F). The strongest colour marks a difference of 3.5 C (6.3 F). 1968: 16.0 C, -0.4 C from the station mean1969: 16.4 C, 0.0 C from the station mean1970: 16.1 C, -0.2 C from the station mean1971: 15.9 C, -0.4 C from the station mean1972: 15.8 C, -0.5 C from the station mean1973: 13.0 C, -3.3 C from the station mean1974: 15.3 C, -1.1 C from the station mean1976: 14.9 C, -1.4 C from the station mean1977: 15.5 C, -0.8 C from the station mean1978: 15.9 C, -0.4 C from the station mean1979: 15.4 C, -0.9 C from the station mean1980: 16.7 C, +0.3 C from the station mean1986: 16.6 C, +0.3 C from the station mean1989: 17.7 C, +1.3 C from the station mean1990: 17.2 C, +0.9 C from the station mean1991: 16.3 C, -0.1 C from the station mean1992: 16.8 C, +0.5 C from the station mean1996: 19.7 C, +3.4 C from the station mean1997: 16.9 C, +0.6 C from the station mean2003: 18.2 C, +1.9 C from the station mean1968197519801985199019952000
One stripe for each of 20 complete years at Ascencion (Smn), 1968 to 2003. Blue stripes are years cooler than the station's own mean of 16.3 C (61.4 F); red stripes are warmer. The coolest year was 1973, at 13.0 C (55.5 F), and the warmest was 1996, at 19.7 C (67.5 F). The strongest colour marks a difference of 3.5 C (6.3 F).
Annual mean temperature at Ascencion (Smn) as warming stripes, 1968 to 2003
YearAnnual mean temperatureDifference from the station mean
196816.0 C-0.36 C
196916.4 C+0.05 C
197016.1 C-0.19 C
197115.9 C-0.41 C
197215.8 C-0.48 C
197313.0 C-3.27 C
197415.3 C-1.06 C
197614.9 C-1.38 C
197715.5 C-0.84 C
197815.9 C-0.38 C
197915.4 C-0.88 C
198016.7 C+0.34 C
198616.6 C+0.27 C
198917.7 C+1.34 C
199017.2 C+0.91 C
199116.3 C-0.05 C
199216.8 C+0.48 C
199619.7 C+3.43 C
199716.9 C+0.62 C
200318.2 C+1.87 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1903 to 2003
Yearly extremes at Ascencion (Smn): the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)50.0 C (122.0 F)199440.6 C (105.1 F)34
Coldest night (TNn)-20.0 C (-4.0 F)1910-9.4 C (15.1 F)43
Wettest day (Rx1day)89.9 mm (3.5 in)194930.0 mm (1.2 in)63
Wettest five days (Rx5day)128.3 mm (5.1 in)197149.5 mm (1.9 in)63
Longest dry spell (CDD)342 days191180 days63

Hottest day (TXx)

Hottest day (TXx) at Ascencion (Smn) by year The hottest day of the year at Ascencion (Smn), 1903 to 2003. The record is 50.0 C (122.0 F) in 1994, marked on the chart; the median year is 40.6 C (105.1 F). 2030405019201940196019802000Record: 50.0 C (122.0 F) in 1994
The hottest day of the year at Ascencion (Smn), 1903 to 2003. The record is 50.0 C (122.0 F) in 1994, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Ascencion (Smn) by year
YearHottest day (TXx)
1903n/a
1904n/a
1905n/a
1906n/a
1907n/a
1908n/a
1909n/a
1910n/a
1911n/a
1912n/a
1948n/a
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
196320.6 C (69.1 F)
1964n/a
1965n/a
1966n/a
196740.0 C (104.0 F)
196840.6 C (105.1 F)
196941.7 C (107.1 F)
197040.0 C (104.0 F)
197138.9 C (102.0 F)
197241.7 C (107.1 F)
197338.9 C (102.0 F)
197442.8 C (109.0 F)
197536.7 C (98.1 F)
197638.9 C (102.0 F)
197740.6 C (105.1 F)
197841.7 C (107.1 F)
197940.6 C (105.1 F)
198041.7 C (107.1 F)
198141.7 C (107.1 F)
198240.6 C (105.1 F)
198322.8 C (73.0 F)
1984n/a
198540.0 C (104.0 F)
198638.9 C (102.0 F)
198740.0 C (104.0 F)
198838.9 C (102.0 F)
198945.6 C (114.1 F)
199045.6 C (114.1 F)
199141.7 C (107.1 F)
199240.6 C (105.1 F)
199348.9 C (120.0 F)
199450.0 C (122.0 F)
199550.0 C (122.0 F)
199650.0 C (122.0 F)
199740.0 C (104.0 F)
199840.0 C (104.0 F)
199937.8 C (100.0 F)
200340.6 C (105.1 F)

Coldest night (TNn)

Coldest night (TNn) at Ascencion (Smn) by year The coldest night of the year at Ascencion (Smn), 1903 to 2003. The record is -20.0 C (-4.0 F) in 1910, marked on the chart; the median year is -9.4 C (15.1 F). -20-15-10-5019201940196019802000Record: -20.0 C (-4.0 F) in 1910
The coldest night of the year at Ascencion (Smn), 1903 to 2003. The record is -20.0 C (-4.0 F) in 1910, marked on the chart; the median year is -9.4 C (15.1 F).
Coldest night (TNn) at Ascencion (Smn) by year
YearColdest night (TNn)
1903-9.4 C (15.1 F)
1904-14.4 C (6.1 F)
1905-8.3 C (17.1 F)
1906-9.4 C (15.1 F)
1907-3.3 C (26.1 F)
1908-9.4 C (15.1 F)
1909-13.3 C (8.1 F)
1910-20.0 C (-4.0 F)
1911-20.0 C (-4.0 F)
1912n/a
1948n/a
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963-7.2 C (19.0 F)
1964n/a
1965n/a
1966n/a
1967-13.3 C (8.1 F)
1968-8.3 C (17.1 F)
1969-8.3 C (17.1 F)
1970-12.2 C (10.0 F)
1971-17.2 C (1.0 F)
1972-14.4 C (6.1 F)
1973-17.2 C (1.0 F)
1974-17.2 C (1.0 F)
1975-11.1 C (12.0 F)
1976-15.0 C (5.0 F)
1977-10.0 C (14.0 F)
1978-17.2 C (1.0 F)
1979-8.3 C (17.1 F)
1980-9.4 C (15.1 F)
1981-4.4 C (24.1 F)
1982-4.4 C (24.1 F)
1983-10.0 C (14.0 F)
1984n/a
1985-9.4 C (15.1 F)
1986-10.0 C (14.0 F)
1987-9.4 C (15.1 F)
1988-13.3 C (8.1 F)
1989-12.2 C (10.0 F)
1990-10.0 C (14.0 F)
1991-9.4 C (15.1 F)
1992-7.2 C (19.0 F)
1993-3.3 C (26.1 F)
19940.0 C (32.0 F)
19950.0 C (32.0 F)
19960.0 C (32.0 F)
19970.0 C (32.0 F)
19980.0 C (32.0 F)
19990.0 C (32.0 F)
2003-3.3 C (26.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Ascencion (Smn) by year The wettest day of the year at Ascencion (Smn), 1903 to 2003. The record is 89.9 mm (3.5 in) in 1949, marked on the chart; the median year is 30.0 mm (1.2 in). 025507510019201940196019802000Record: 89.9 mm (3.5 in) in 1949
The wettest day of the year at Ascencion (Smn), 1903 to 2003. The record is 89.9 mm (3.5 in) in 1949, marked on the chart; the median year is 30.0 mm (1.2 in).
Wettest day (Rx1day) at Ascencion (Smn) by year
YearWettest day (Rx1day)
190319.8 mm (0.8 in)
190419.8 mm (0.8 in)
190537.3 mm (1.5 in)
190633.3 mm (1.3 in)
190769.9 mm (2.8 in)
190822.9 mm (0.9 in)
190987.4 mm (3.4 in)
191010.9 mm (0.4 in)
191115.5 mm (0.6 in)
19120.0 mm (0.00 in)
194819.8 mm (0.8 in)
194989.9 mm (3.5 in)
195071.9 mm (2.8 in)
19519.9 mm (0.39 in)
195239.9 mm (1.6 in)
195359.9 mm (2.4 in)
195430.0 mm (1.2 in)
195530.0 mm (1.2 in)
195617.8 mm (0.7 in)
195724.9 mm (1.0 in)
195842.9 mm (1.7 in)
195924.9 mm (1.0 in)
196015.7 mm (0.6 in)
196165.8 mm (2.6 in)
196219.8 mm (0.8 in)
196359.9 mm (2.4 in)
196445.0 mm (1.8 in)
196531.8 mm (1.3 in)
196651.8 mm (2.0 in)
196731.8 mm (1.3 in)
196851.3 mm (2.0 in)
196931.0 mm (1.2 in)
197018.8 mm (0.7 in)
197152.8 mm (2.1 in)
197256.4 mm (2.2 in)
197325.4 mm (1.0 in)
197419.8 mm (0.8 in)
197546.0 mm (1.8 in)
197637.3 mm (1.5 in)
197750.8 mm (2.0 in)
197831.8 mm (1.3 in)
197923.4 mm (0.9 in)
198022.4 mm (0.9 in)
198150.3 mm (2.0 in)
198229.0 mm (1.1 in)
198319.8 mm (0.8 in)
198419.8 mm (0.8 in)
198518.8 mm (0.7 in)
198630.0 mm (1.2 in)
19877.9 mm (0.31 in)
19888.9 mm (0.35 in)
198930.0 mm (1.2 in)
199028.2 mm (1.1 in)
199126.2 mm (1.0 in)
199224.9 mm (1.0 in)
199330.0 mm (1.2 in)
199430.0 mm (1.2 in)
19955.8 mm (0.23 in)
199626.9 mm (1.1 in)
199757.9 mm (2.3 in)
199819.8 mm (0.8 in)
199946.0 mm (1.8 in)
200324.9 mm (1.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Ascencion (Smn) by year The wettest five days of the year at Ascencion (Smn), 1903 to 2003. The record is 128.3 mm (5.1 in) in 1971, marked on the chart; the median year is 49.5 mm (1.9 in). 05010015019201940196019802000Record: 128.3 mm (5.1 in) in 1971
The wettest five days of the year at Ascencion (Smn), 1903 to 2003. The record is 128.3 mm (5.1 in) in 1971, marked on the chart; the median year is 49.5 mm (1.9 in).
Wettest five days (Rx5day) at Ascencion (Smn) by year
YearWettest five days (Rx5day)
190323.6 mm (0.9 in)
190432.5 mm (1.3 in)
190546.0 mm (1.8 in)
190650.6 mm (2.0 in)
190775.2 mm (3.0 in)
190834.6 mm (1.4 in)
1909114.9 mm (4.5 in)
191013.5 mm (0.5 in)
191119.8 mm (0.8 in)
19120.0 mm (0.00 in)
194826.7 mm (1.1 in)
1949109.7 mm (4.3 in)
195077.7 mm (3.1 in)
195110.4 mm (0.4 in)
195245.7 mm (1.8 in)
195378.0 mm (3.1 in)
195430.0 mm (1.2 in)
195535.1 mm (1.4 in)
195631.3 mm (1.2 in)
195758.4 mm (2.3 in)
195872.7 mm (2.9 in)
195954.6 mm (2.1 in)
196019.8 mm (0.8 in)
1961108.2 mm (4.3 in)
196251.5 mm (2.0 in)
196388.1 mm (3.5 in)
196464.8 mm (2.6 in)
196544.0 mm (1.7 in)
196665.3 mm (2.6 in)
196752.2 mm (2.1 in)
196858.2 mm (2.3 in)
196951.1 mm (2.0 in)
197030.2 mm (1.2 in)
1971128.3 mm (5.1 in)
197264.0 mm (2.5 in)
197360.2 mm (2.4 in)
197435.8 mm (1.4 in)
197561.7 mm (2.4 in)
197655.6 mm (2.2 in)
197778.5 mm (3.1 in)
197839.6 mm (1.6 in)
197942.2 mm (1.7 in)
198024.7 mm (1.0 in)
198158.7 mm (2.3 in)
198249.5 mm (1.9 in)
198336.6 mm (1.4 in)
198433.3 mm (1.3 in)
198532.6 mm (1.3 in)
198658.7 mm (2.3 in)
198717.2 mm (0.7 in)
198823.4 mm (0.9 in)
198965.0 mm (2.6 in)
199070.9 mm (2.8 in)
199167.7 mm (2.7 in)
199267.6 mm (2.7 in)
199337.6 mm (1.5 in)
199436.9 mm (1.5 in)
19955.8 mm (0.23 in)
199626.9 mm (1.1 in)
199771.5 mm (2.8 in)
199830.5 mm (1.2 in)
199987.6 mm (3.4 in)
200329.7 mm (1.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Ascencion (Smn) by year The longest dry spell of the year at Ascencion (Smn), 1903 to 2003. The record is 342 days in 1911, marked on the chart; the median year is 80 days. 010020030040019201940196019802000Record: 342 days in 1911
The longest dry spell of the year at Ascencion (Smn), 1903 to 2003. The record is 342 days in 1911, marked on the chart; the median year is 80 days.
Longest dry spell (CDD) at Ascencion (Smn) by year
YearLongest dry spell (CDD)
190395 days
1904123 days
190534 days
190632 days
1907161 days
1908191 days
190993 days
1910117 days
1911342 days
191260 days
194855 days
1949157 days
1950124 days
195192 days
195239 days
1953184 days
1954136 days
1955196 days
1956119 days
1957122 days
195859 days
195974 days
1960110 days
1961134 days
196249 days
196390 days
1964151 days
196595 days
1966132 days
1967137 days
196845 days
1969143 days
197075 days
197183 days
1972135 days
197358 days
197469 days
197572 days
197641 days
197756 days
197880 days
197987 days
198052 days
198136 days
198247 days
198346 days
1984128 days
198540 days
198662 days
198754 days
198878 days
198962 days
199055 days
199175 days
199244 days
1993111 days
199470 days
199531 days
199634 days
199730 days
199881 days
1999183 days
200389 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at Ascencion (Smn) falls on 8 April and the median first autumn frost on 29 October, which leaves a median of 208 days between them.

Frost dates and growing season at Ascencion (Smn)
MeasureMedian, all yearsEarliest periodRecent period (1968 to 2003)Recent against earliestFitted trend
Last spring frost8 Apriln/a8 Apriln/an/a
First autumn frost29 Octobern/a29 Octobern/an/a
Growing days208 daysn/a208 daysn/an/a

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

52 years, 1904 to 2003

A day with at least 30.1 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 106.6 mm (4.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Ascencion (Smn): the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years30.1 mm (1.2 in)
5 years47.1 mm (1.9 in)
10 years59.7 mm (2.4 in)
25 years77.1 mm (3.0 in)
50 years91.3 mm (3.6 in)
100 years106.6 mm (4.2 in)Longer than the 52 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 52 years of values from 1904 to 2003.

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: 89.9 mm (3.5 in) in 1949; 87.4 mm (3.4 in) in 1909; 71.9 mm (2.8 in) in 1950.

Download the Data

  • Data for Ascencion (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Ascencion (Smn) 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 (2025-12-31).