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Washington Wwtp 4W Weather Records (USC00319100)

Record envelope, standing records and threshold days for Washington Wwtp 4W (USC00319100), North Carolina, United States, with 134 years of record.

Key Facts for Washington Wwtp 4W

  • Washington Wwtp 4W (USC00319100) is a weather station in North Carolina, United States at 35.55 latitude and -77.07 longitude, 3 m (10 ft) above sea level.
  • The station reports from 1893 to 2026, 134 years of record.
  • 1,464 records set at Washington Wwtp 4W still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Washington Wwtp 4W set a daily record precipitation of 66.8 mm (2.6 in) on 20 July 2026.

About the Station

  • Location: North Carolina, United States, 35.55 latitude, -77.07 longitude.
  • Elevation: 3 m (10 ft).
  • Period of record: 1893 to 2026, 134 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

25 days at or beyond a record
Daily record high and record low at Washington Wwtp 4W, with 2026 drawn through them The band shows the record high and record low for each calendar day at Washington Wwtp 4W. The lines show the 2026 daily maximum and minimum. 25 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 Washington Wwtp 4W. The lines show the 2026 daily maximum and minimum. 25 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Washington Wwtp 4W, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan27.2 C (81.0 F)-18.3 C (-0.9 F)23.9 C (75.0 F)-7.8 C (18.0 F)
Feb28.9 C (84.0 F)-15.6 C (3.9 F)25.6 C (78.1 F)-9.4 C (15.1 F)
Mar35.0 C (95.0 F)-7.2 C (19.0 F)30.6 C (87.1 F)-1.1 C (30.0 F)
Apr32.8 C (91.0 F)-1.7 C (28.9 F)32.8 C (91.0 F)2.2 C (36.0 F)
May36.1 C (97.0 F)2.2 C (36.0 F)33.3 C (91.9 F)7.2 C (45.0 F)
Jun38.3 C (100.9 F)8.3 C (46.9 F)38.3 C (100.9 F)10.6 C (51.1 F)
Jul40.6 C (105.1 F)13.9 C (57.0 F)36.7 C (98.1 F)19.4 C (66.9 F)
Aug41.7 C (107.1 F)10.6 C (51.1 F)36.7 C (98.1 F)20.6 C (69.1 F)
Sep37.2 C (99.0 F)5.6 C (42.1 F)35.6 C (96.1 F)12.8 C (55.0 F)
Oct33.9 C (93.0 F)-2.2 C (28.0 F)31.7 C (89.1 F)10.6 C (51.1 F)
Nov29.4 C (84.9 F)-7.8 C (18.0 F)n/an/a
Dec30.0 C (86.0 F)-10.6 C (12.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Washington Wwtp 4W by the year they were set 1,464 records at Washington Wwtp 4W still stand. 1903 holds the most, with 70. 0204060801893: 431894: 331900: 631901: 431902: 631903: 701904: 651905: 561906: 541907: 481968: 32004: 102005: 432006: 392007: 422008: 482009: 452010: 532011: 452012: 312013: 432014: 452015: 522016: 312017: 522018: 502019: 392020: 402021: 312022: 422023: 452024: 302025: 282026: 39189319021906200520092013201720212025
1,464 records at Washington Wwtp 4W still stand. 1903 holds the most, with 70.
Standing records at Washington Wwtp 4W by the year they were set
Year setStanding records
189343
189433
190063
190143
190263
190370
190465
190556
190654
190748
19683
200410
200543
200639
200742
200848
200945
201053
201145
201231
201343
201445
201552
201631
201752
201850
201939
202040
202131
202242
202345
202430
202528
202639

All-Time Record Progression

4 new records
When Washington Wwtp 4W set new all-time records 4 all-time records were set at Washington Wwtp 4W between 2 March 1980 and 27 August 2011. Each dot is a new record. Record daily snowfallRecord snow depthRecord daily precipitation2 March 1980: Record daily snowfall 38.4 cm (15.1 in)3 March 1980: Record snow depth 40.6 cm (16.0 in)30 September 2010: Record daily precipitation 204.7 mm (8.1 in)27 August 2011: Record daily precipitation 289.6 mm (11.4 in)1980198519901995200020052010
4 all-time records were set at Washington Wwtp 4W between 2 March 1980 and 27 August 2011. Each dot is a new record.
When Washington Wwtp 4W set new all-time records
DateKindDetail
1980-03-02Record daily snowfallRecord daily snowfall 38.4 cm (15.1 in)
1980-03-03Record snow depthRecord snow depth 40.6 cm (16.0 in)
2010-09-30Record daily precipitationRecord daily precipitation 204.7 mm (8.1 in)
2011-08-27Record daily precipitationRecord daily precipitation 289.6 mm (11.4 in)

Wettest Day of Each Month

Aug: 289.6 mm (11.4 in)
Record daily precipitation for each month at Washington Wwtp 4W The wettest day on record for each calendar month at Washington Wwtp 4W. The most was 289.6 mm (11.4 in) on 27 August 2011. 0100200300 Jan: 114.3 mm (4.5 in), 29 January 2014 Jan Feb: 110.2 mm (4.3 in), 27 February 1906 Feb Mar: 113.5 mm (4.5 in), 30 March 1991 Mar Apr: 82.8 mm (3.3 in), 16 April 2007 Apr May: 114.3 mm (4.5 in), 16 May 2014 May Jun: 169.4 mm (6.7 in), 30 June 1962 Jun Jul: 149.4 mm (5.9 in), 24 July 1985 Jul Aug: 289.6 mm (11.4 in), 27 August 2011 Aug Sep: 204.7 mm (8.1 in), 30 September 2010 Sep Oct: 203.2 mm (8.0 in), 8 October 2016 Oct Nov: 133.9 mm (5.3 in), 6 November 1977 Nov Dec: 52.6 mm (2.1 in), 17 December 2023 Dec
The wettest day on record for each calendar month at Washington Wwtp 4W. The most was 289.6 mm (11.4 in) on 27 August 2011.
Record daily precipitation for each month at Washington Wwtp 4W
MonthRecord daily precipitation (mm)Date
Jan114.3 mm (4.5 in)29 January 2014
Feb110.2 mm (4.3 in)27 February 1906
Mar113.5 mm (4.5 in)30 March 1991
Apr82.8 mm (3.3 in)16 April 2007
May114.3 mm (4.5 in)16 May 2014
Jun169.4 mm (6.7 in)30 June 1962
Jul149.4 mm (5.9 in)24 July 1985
Aug289.6 mm (11.4 in)27 August 2011
Sep204.7 mm (8.1 in)30 September 2010
Oct203.2 mm (8.0 in)8 October 2016
Nov133.9 mm (5.3 in)6 November 1977
Dec52.6 mm (2.1 in)17 December 2023

Period of Record Coverage

1893 to 2026
Days with data per year at Washington Wwtp 4W 34 years of record at Washington Wwtp 4W, 1893 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1900, 1901, 1902, 1907, 1968, 2004 and others. 1893: 180 of 365 days1894: 182 of 365 days1900: 268 of 365 days1901: 327 of 365 days1902: 317 of 365 days1903: 364 of 365 days1904: 363 of 366 days1905: 363 of 365 days1906: 365 of 365 days1907: 180 of 365 days1968: 30 of 366 days2004: 81 of 366 days2005: 365 of 365 days2006: 363 of 365 days2007: 365 of 365 days2008: 364 of 366 days2009: 364 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 361 of 365 days2014: 333 of 365 days2015: 364 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 335 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 280 of 365 days1900190520052010201520202025
34 years of record at Washington Wwtp 4W, 1893 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1900, 1901, 1902, 1907, 1968, 2004 and others.
Days with data per year at Washington Wwtp 4W
YearDays with dataShare of yearComplete
189318049%No
189418250%No
190026873%No
190132790%No
190231787%No
1903364100%Yes
190436399%Yes
190536399%Yes
1906365100%Yes
190718049%No
1968308%No
20048122%No
2005365100%Yes
200636399%Yes
2007365100%Yes
200836499%Yes
2009364100%Yes
2010364100%Yes
2011365100%Yes
2012366100%Yes
201336199%Yes
201433391%Yes
2015364100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
202033592%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628077%No

Latest Records

20
Latest records at Washington Wwtp 4W
DateStationRecordValueBeat old record byOld record stoodSignificance
20 July 2026Washington Wwtp 4W, USdaily rain66.8 mm (2.6 in)28.7 mm (1.1 in)13 years31 of 100 (Routine)
2 February 2026Washington Wwtp 4W, USdaily snow depth15.2 cm (6.0 in)7.6 cm (3.0 in)78 years47 of 100 (Notable)
1 February 2026Washington Wwtp 4W, USmonthly snow depth (Tie)22.9 cm (9.0 in)tie52 years8 of 100 (Routine)
31 January 2026Washington Wwtp 4W, USmonthly snowfall17.8 cm (7.0 in)2.6 cm (1.0 in)122 years56 of 100 (Notable)
31 January 2026Washington Wwtp 4W, USmonthly snow depth (Tie)17.8 cm (7.0 in)tie61 years9 of 100 (Routine)
6 July 2025Washington Wwtp 4W, USdaily rain (Tie)46.0 mm (1.8 in)tie75 years8 of 100 (Routine)
16 June 2025Washington Wwtp 4W, USdaily rain96.0 mm (3.8 in)51.8 mm (2.0 in)60 years58 of 100 (Notable)
13 May 2025Washington Wwtp 4W, USdaily rain70.9 mm (2.8 in)15.5 mm (0.6 in)54 years37 of 100 (Notable)
12 May 2025Washington Wwtp 4W, USdaily rain50.5 mm (2.0 in)6.3 mm (0.25 in)75 years36 of 100 (Notable)
20 February 2025Washington Wwtp 4W, USdaily snowfall (Tie)0.3 cm (0.1 in)tie5 years2 of 100 (Routine)
23 January 2025Washington Wwtp 4W, USdaily snow depth5.1 cm (2.0 in)5.1 cm (2.0 in)76 years20 of 100 (Routine)
22 January 2025Washington Wwtp 4W, USdaily snow depth (Tie)10.2 cm (4.0 in)tie3 years2 of 100 (Routine)
21 January 2025Washington Wwtp 4W, USdaily snowfall1.3 cm (0.5 in)1.3 cm (0.5 in)124 years20 of 100 (Routine)
11 December 2024Washington Wwtp 4W, USdaily rain48.5 mm (1.9 in)19.8 mm (0.8 in)63 years46 of 100 (Notable)
6 August 2024Washington Wwtp 4W, USdaily rain55.4 mm (2.2 in)5.4 mm (0.21 in)41 years24 of 100 (Routine)
25 July 2024Washington Wwtp 4W, USdaily rain60.7 mm (2.4 in)8.9 mm (0.35 in)24 years22 of 100 (Routine)
11 July 2024Washington Wwtp 4W, USdaily rain74.9 mm (2.9 in)7.8 mm (0.31 in)39 years25 of 100 (Routine)
5 July 2024Washington Wwtp 4W, USdaily rain63.5 mm (2.5 in)15.5 mm (0.6 in)56 years35 of 100 (Notable)
23 March 2024Washington Wwtp 4W, USdaily rain40.4 mm (1.6 in)17.0 mm (0.7 in)50 years39 of 100 (Notable)
6 March 2024Washington Wwtp 4W, USdaily rain38.6 mm (1.5 in)14.2 mm (0.6 in)40 years33 of 100 (Routine)

Climate Trend

23 complete years, 1903 to 2025
Annual mean temperature at Washington Wwtp 4W as warming stripes, 1903 to 2025 One stripe for each of 23 complete years at Washington Wwtp 4W, 1903 to 2025. Blue stripes are years cooler than the station's own mean of 17.0 C (62.5 F); red stripes are warmer. The coolest year was 1904, at 15.5 C (59.9 F), and the warmest was 2024, at 18.1 C (64.6 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1903: 17.1 C, +0.2 C from the station mean1904: 15.5 C, -1.4 C from the station mean1905: 16.3 C, -0.6 C from the station mean1906: 17.2 C, +0.3 C from the station mean2005: 16.5 C, -0.4 C from the station mean2006: 16.8 C, -0.2 C from the station mean2007: 17.1 C, +0.1 C from the station mean2008: 17.4 C, +0.4 C from the station mean2009: 16.9 C, 0.0 C from the station mean2010: 16.8 C, -0.1 C from the station mean2011: 17.8 C, +0.9 C from the station mean2012: 17.7 C, +0.7 C from the station mean2013: 16.7 C, -0.3 C from the station mean2015: 16.9 C, -0.1 C from the station mean2016: 16.6 C, -0.3 C from the station mean2017: 16.7 C, -0.3 C from the station mean2018: 15.8 C, -1.2 C from the station mean2019: 15.6 C, -1.4 C from the station mean2021: 17.7 C, +0.7 C from the station mean2022: 17.7 C, +0.7 C from the station mean2023: 18.0 C, +1.0 C from the station mean2024: 18.1 C, +1.1 C from the station mean2025: 17.4 C, +0.4 C from the station mean1903191019201930194019501960197019801990200020102020
One stripe for each of 23 complete years at Washington Wwtp 4W, 1903 to 2025. Blue stripes are years cooler than the station's own mean of 17.0 C (62.5 F); red stripes are warmer. The coolest year was 1904, at 15.5 C (59.9 F), and the warmest was 2024, at 18.1 C (64.6 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Washington Wwtp 4W as warming stripes, 1903 to 2025
YearAnnual mean temperatureDifference from the station mean
190317.1 C+0.16 C
190415.5 C-1.45 C
190516.3 C-0.63 C
190617.2 C+0.27 C
200516.5 C-0.44 C
200616.8 C-0.19 C
200717.1 C+0.11 C
200817.4 C+0.38 C
200916.9 C-0.05 C
201016.8 C-0.15 C
201117.8 C+0.85 C
201217.7 C+0.74 C
201316.7 C-0.31 C
201516.9 C-0.10 C
201616.6 C-0.34 C
201716.7 C-0.26 C
201815.8 C-1.16 C
201915.6 C-1.39 C
202117.7 C+0.68 C
202217.7 C+0.70 C
202318.0 C+1.00 C
202418.1 C+1.13 C
202517.4 C+0.40 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

1893 to 2026
Yearly extremes at Washington Wwtp 4W: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.7 C (107.1 F)190036.7 C (98.1 F)34
Coldest night (TNn)-18.3 C (-0.9 F)2018-8.9 C (16.0 F)34
Wettest day (Rx1day)289.6 mm (11.4 in)201179.5 mm (3.1 in)98
Wettest five days (Rx5day)444.0 mm (17.5 in)2010126.0 mm (5.0 in)97
Longest dry spell (CDD)47 days200119 days98

Hottest day (TXx)

Hottest day (TXx) at Washington Wwtp 4W by year The hottest day of the year at Washington Wwtp 4W, 1893 to 2026. The record is 41.7 C (107.1 F) in 1900, marked on the chart; the median year is 36.7 C (98.1 F). 25303540451900192019401960198020002020Record: 41.7 C (107.1 F) in 1900
The hottest day of the year at Washington Wwtp 4W, 1893 to 2026. The record is 41.7 C (107.1 F) in 1900, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Washington Wwtp 4W by year
YearHottest day (TXx)
189338.3 C (100.9 F)
189435.0 C (95.0 F)
190041.7 C (107.1 F)
190140.6 C (105.1 F)
190240.6 C (105.1 F)
190338.3 C (100.9 F)
190437.2 C (99.0 F)
190536.7 C (98.1 F)
190636.7 C (98.1 F)
190735.0 C (95.0 F)
1921n/a
1922n/a
1923n/a
1924n/a
1937n/a
1938n/a
1939n/a
1946n/a
1947n/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
1963n/a
1964n/a
1965n/a
1966n/a
1967n/a
196836.7 C (98.1 F)
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
200428.9 C (84.0 F)
200537.2 C (99.0 F)
200636.7 C (98.1 F)
200737.8 C (100.0 F)
200838.3 C (100.9 F)
200936.1 C (97.0 F)
201038.3 C (100.9 F)
201139.4 C (102.9 F)
201237.2 C (99.0 F)
201336.1 C (97.0 F)
201435.0 C (95.0 F)
201537.2 C (99.0 F)
201635.0 C (95.0 F)
201733.9 C (93.0 F)
201834.4 C (93.9 F)
201934.4 C (93.9 F)
202036.1 C (97.0 F)
202134.4 C (93.9 F)
202236.7 C (98.1 F)
202337.2 C (99.0 F)
202436.7 C (98.1 F)
202537.2 C (99.0 F)
202638.3 C (100.9 F)

Coldest night (TNn)

Coldest night (TNn) at Washington Wwtp 4W by year The coldest night of the year at Washington Wwtp 4W, 1893 to 2026. The record is -18.3 C (-0.9 F) in 2018, marked on the chart; the median year is -8.9 C (16.0 F). -20-10010201900192019401960198020002020Record: -18.3 C (-0.9 F) in 2018
The coldest night of the year at Washington Wwtp 4W, 1893 to 2026. The record is -18.3 C (-0.9 F) in 2018, marked on the chart; the median year is -8.9 C (16.0 F).
Coldest night (TNn) at Washington Wwtp 4W by year
YearColdest night (TNn)
1893-6.1 C (21.0 F)
1894-5.0 C (23.0 F)
1900-15.6 C (3.9 F)
1901-10.6 C (12.9 F)
1902-7.8 C (18.0 F)
1903-8.3 C (17.1 F)
1904-12.8 C (9.0 F)
1905-11.1 C (12.0 F)
1906-8.9 C (16.0 F)
1907-8.9 C (16.0 F)
1921n/a
1922n/a
1923n/a
1924n/a
1937n/a
1938n/a
1939n/a
1946n/a
1947n/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
1963n/a
1964n/a
1965n/a
1966n/a
1967n/a
196811.7 C (53.1 F)
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004-10.0 C (14.0 F)
2005-9.4 C (15.1 F)
2006-6.7 C (19.9 F)
2007-8.3 C (17.1 F)
2008-7.2 C (19.0 F)
2009-8.9 C (16.0 F)
2010-8.9 C (16.0 F)
2011-7.8 C (18.0 F)
2012-5.6 C (21.9 F)
2013-6.7 C (19.9 F)
2014-10.6 C (12.9 F)
2015-12.2 C (10.0 F)
2016-8.9 C (16.0 F)
2017-11.1 C (12.0 F)
2018-18.3 C (-0.9 F)
2019-8.9 C (16.0 F)
2020-7.8 C (18.0 F)
2021-5.0 C (23.0 F)
2022-8.3 C (17.1 F)
2023-4.4 C (24.1 F)
2024-6.7 C (19.9 F)
2025-10.0 C (14.0 F)
2026-9.4 C (15.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Washington Wwtp 4W by year The wettest day of the year at Washington Wwtp 4W, 1893 to 2026. The record is 289.6 mm (11.4 in) in 2011, marked on the chart; the median year is 79.5 mm (3.1 in). 01002003001900192019401960198020002020Record: 289.6 mm (11.4 in) in 2011
The wettest day of the year at Washington Wwtp 4W, 1893 to 2026. The record is 289.6 mm (11.4 in) in 2011, marked on the chart; the median year is 79.5 mm (3.1 in).
Wettest day (Rx1day) at Washington Wwtp 4W by year
YearWettest day (Rx1day)
189354.9 mm (2.2 in)
189473.9 mm (2.9 in)
190079.0 mm (3.1 in)
190171.1 mm (2.8 in)
190250.8 mm (2.0 in)
190393.0 mm (3.7 in)
190457.4 mm (2.3 in)
190555.1 mm (2.2 in)
1906110.2 mm (4.3 in)
190778.0 mm (3.1 in)
192169.9 mm (2.8 in)
192250.0 mm (2.0 in)
192361.0 mm (2.4 in)
19240.0 mm (0.00 in)
193725.4 mm (1.0 in)
193873.7 mm (2.9 in)
193952.8 mm (2.1 in)
194692.5 mm (3.6 in)
1947192.5 mm (7.6 in)
194878.7 mm (3.1 in)
1949128.3 mm (5.1 in)
195057.9 mm (2.3 in)
1951134.1 mm (5.3 in)
195274.4 mm (2.9 in)
195395.3 mm (3.8 in)
195460.7 mm (2.4 in)
1955179.8 mm (7.1 in)
195687.4 mm (3.4 in)
195759.9 mm (2.4 in)
195849.5 mm (1.9 in)
195962.5 mm (2.5 in)
1960129.5 mm (5.1 in)
196166.0 mm (2.6 in)
1962169.4 mm (6.7 in)
1963102.4 mm (4.0 in)
1964141.0 mm (5.6 in)
1965122.2 mm (4.8 in)
196663.5 mm (2.5 in)
196777.5 mm (3.1 in)
196873.9 mm (2.9 in)
1969117.1 mm (4.6 in)
197057.2 mm (2.3 in)
1971128.3 mm (5.1 in)
197291.4 mm (3.6 in)
197391.4 mm (3.6 in)
197456.6 mm (2.2 in)
197584.6 mm (3.3 in)
197654.9 mm (2.2 in)
1977133.9 mm (5.3 in)
197862.5 mm (2.5 in)
197958.9 mm (2.3 in)
198077.0 mm (3.0 in)
198163.0 mm (2.5 in)
1982100.3 mm (3.9 in)
198370.6 mm (2.8 in)
198475.4 mm (3.0 in)
1985149.4 mm (5.9 in)
198654.6 mm (2.1 in)
198780.0 mm (3.1 in)
198852.8 mm (2.1 in)
198944.2 mm (1.7 in)
199070.6 mm (2.8 in)
1991113.5 mm (4.5 in)
199263.8 mm (2.5 in)
199350.8 mm (2.0 in)
1994102.4 mm (4.0 in)
1995114.3 mm (4.5 in)
1996125.7 mm (4.9 in)
199747.0 mm (1.9 in)
1998139.7 mm (5.5 in)
1999161.5 mm (6.4 in)
200092.7 mm (3.6 in)
200178.7 mm (3.1 in)
200253.8 mm (2.1 in)
2003124.5 mm (4.9 in)
200451.3 mm (2.0 in)
2005131.8 mm (5.2 in)
2006165.6 mm (6.5 in)
200782.8 mm (3.3 in)
200882.8 mm (3.3 in)
2009107.7 mm (4.2 in)
2010204.7 mm (8.1 in)
2011289.6 mm (11.4 in)
201274.2 mm (2.9 in)
201388.9 mm (3.5 in)
2014115.1 mm (4.5 in)
2015140.5 mm (5.5 in)
2016203.2 mm (8.0 in)
201788.9 mm (3.5 in)
201885.3 mm (3.4 in)
201975.2 mm (3.0 in)
2020125.5 mm (4.9 in)
2021125.2 mm (4.9 in)
2022117.1 mm (4.6 in)
202387.4 mm (3.4 in)
202474.9 mm (2.9 in)
202596.0 mm (3.8 in)
202666.8 mm (2.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Washington Wwtp 4W by year The wettest five days of the year at Washington Wwtp 4W, 1893 to 2026. The record is 444.0 mm (17.5 in) in 2010, marked on the chart; the median year is 126.0 mm (5.0 in). 02004006001900192019401960198020002020Record: 444.0 mm (17.5 in) in 2010
The wettest five days of the year at Washington Wwtp 4W, 1893 to 2026. The record is 444.0 mm (17.5 in) in 2010, marked on the chart; the median year is 126.0 mm (5.0 in).
Wettest five days (Rx5day) at Washington Wwtp 4W by year
YearWettest five days (Rx5day)
1893105.6 mm (4.2 in)
189495.3 mm (3.8 in)
190079.0 mm (3.1 in)
1901106.5 mm (4.2 in)
190290.2 mm (3.6 in)
1903118.8 mm (4.7 in)
1904136.7 mm (5.4 in)
190584.4 mm (3.3 in)
1906127.7 mm (5.0 in)
1907133.6 mm (5.3 in)
192183.4 mm (3.3 in)
1922103.5 mm (4.1 in)
1923127.3 mm (5.0 in)
1924n/a
193735.6 mm (1.4 in)
1938159.0 mm (6.3 in)
1939101.1 mm (4.0 in)
1946126.0 mm (5.0 in)
1947251.1 mm (9.9 in)
194890.4 mm (3.6 in)
1949139.0 mm (5.5 in)
1950205.7 mm (8.1 in)
1951202.1 mm (8.0 in)
1952111.2 mm (4.4 in)
1953101.0 mm (4.0 in)
195465.8 mm (2.6 in)
1955209.7 mm (8.3 in)
1956134.5 mm (5.3 in)
1957119.6 mm (4.7 in)
195893.2 mm (3.7 in)
1959156.9 mm (6.2 in)
1960150.1 mm (5.9 in)
1961112.2 mm (4.4 in)
1962276.9 mm (10.9 in)
1963102.4 mm (4.0 in)
1964157.3 mm (6.2 in)
1965141.0 mm (5.6 in)
196690.2 mm (3.6 in)
1967156.4 mm (6.2 in)
1968104.4 mm (4.1 in)
1969138.5 mm (5.5 in)
197085.4 mm (3.4 in)
1971246.6 mm (9.7 in)
1972101.0 mm (4.0 in)
1973106.2 mm (4.2 in)
197491.6 mm (3.6 in)
1975141.8 mm (5.6 in)
197660.6 mm (2.4 in)
1977143.0 mm (5.6 in)
197881.4 mm (3.2 in)
197977.2 mm (3.0 in)
198089.7 mm (3.5 in)
1981110.3 mm (4.3 in)
1982106.7 mm (4.2 in)
1983107.9 mm (4.2 in)
1984154.8 mm (6.1 in)
1985197.2 mm (7.8 in)
1986104.7 mm (4.1 in)
1987109.5 mm (4.3 in)
198864.1 mm (2.5 in)
198988.9 mm (3.5 in)
1990108.2 mm (4.3 in)
1991130.4 mm (5.1 in)
1992203.2 mm (8.0 in)
199360.4 mm (2.4 in)
1994107.7 mm (4.2 in)
1995168.9 mm (6.6 in)
1996164.6 mm (6.5 in)
199777.7 mm (3.1 in)
1998141.7 mm (5.6 in)
1999393.1 mm (15.5 in)
2000151.3 mm (6.0 in)
2001142.1 mm (5.6 in)
200270.9 mm (2.8 in)
2003147.4 mm (5.8 in)
200491.4 mm (3.6 in)
2005280.9 mm (11.1 in)
2006187.2 mm (7.4 in)
200791.2 mm (3.6 in)
200887.7 mm (3.5 in)
2009199.9 mm (7.9 in)
2010444.0 mm (17.5 in)
2011407.4 mm (16.0 in)
2012164.0 mm (6.5 in)
2013108.5 mm (4.3 in)
2014163.3 mm (6.4 in)
2015188.2 mm (7.4 in)
2016241.9 mm (9.5 in)
2017104.3 mm (4.1 in)
2018152.2 mm (6.0 in)
2019122.9 mm (4.8 in)
2020137.7 mm (5.4 in)
2021156.6 mm (6.2 in)
2022120.7 mm (4.8 in)
2023128.0 mm (5.0 in)
2024127.0 mm (5.0 in)
2025130.3 mm (5.1 in)
2026145.3 mm (5.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Washington Wwtp 4W by year The longest dry spell of the year at Washington Wwtp 4W, 1893 to 2026. The record is 47 days in 2001, marked on the chart; the median year is 19 days. 02040601900192019401960198020002020Record: 47 days in 2001
The longest dry spell of the year at Washington Wwtp 4W, 1893 to 2026. The record is 47 days in 2001, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Washington Wwtp 4W by year
YearLongest dry spell (CDD)
189315 days
189411 days
190015 days
190120 days
190212 days
190317 days
190422 days
190519 days
190621 days
190716 days
192113 days
192214 days
192320 days
19242 days
193714 days
193820 days
193918 days
194618 days
194715 days
194815 days
194911 days
195021 days
195114 days
195218 days
195320 days
195424 days
195515 days
195617 days
195719 days
195824 days
195911 days
196016 days
196123 days
196219 days
196319 days
196419 days
196531 days
196624 days
196720 days
196820 days
196918 days
197025 days
197115 days
197221 days
197323 days
197423 days
197514 days
197619 days
197718 days
197821 days
197912 days
198015 days
198121 days
198217 days
198319 days
198427 days
198530 days
198623 days
198726 days
198821 days
198912 days
199021 days
199122 days
199219 days
199317 days
199415 days
199519 days
199620 days
199717 days
199825 days
199922 days
200025 days
200147 days
200216 days
200321 days
200415 days
200516 days
200620 days
200727 days
200827 days
200913 days
201021 days
201121 days
201214 days
201318 days
201421 days
201514 days
201613 days
201715 days
201815 days
201922 days
202013 days
202116 days
202227 days
202322 days
202425 days
202526 days
202619 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at Washington Wwtp 4W falls on 29 March and the median first autumn frost on 13 November, which leaves a median of 232 days between them.

Frost dates and growing season at Washington Wwtp 4W
MeasureMedian, all yearsEarliest periodRecent period (1903 to 2025)Recent against earliestFitted trend
Last spring frost29 Marchn/a29 Marchn/an/a
First autumn frost13 Novembern/a13 Novembern/an/a
Growing days232 daysn/a232 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

87 years, 1901 to 2025

A day with at least 86.9 mm (3.4 in) of rain is expected about once in 2 years. A day with at least 259.7 mm (10.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Washington Wwtp 4W: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years86.9 mm (3.4 in)
5 years123.2 mm (4.9 in)
10 years150.8 mm (5.9 in)
25 years190.3 mm (7.5 in)
50 years223.4 mm (8.8 in)
100 years259.7 mm (10.2 in)Longer than the 87 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, 87 years of values from 1901 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: 289.6 mm (11.4 in) in 2011; 204.7 mm (8.1 in) in 2010; 203.2 mm (8.0 in) in 2016.

Download the Data

  • Data for Washington Wwtp 4W standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Washington Wwtp 4W 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 (2026-10-12).