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Data as of 2026-10-12
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Built 2026-10-14 (14 October 2026)

Seattle Threshold Days: Hot, Cold and Wet Days per Year

16 fixed thresholds counted per year for Seattle: days at or above 30 C and 100 F, frost, tropical nights and heavy rain, with rankings and streaks.

Key Facts for Seattle Thresholds

  • Seattle: nights with a minimum temperature at or below Frost days (min at or below 0 C) (32 F) in 79 years, most in 1985 with 76.
  • Seattle: days with Days with 10 mm or more rain (0.39 in) or more of precipitation in 79 years, most in 2014 with 47.
  • Seattle: days with Days with 25 mm or more rain (0.98 in) or more of precipitation in 78 years, most in 2015 with 14.
  • Seattle: days with a maximum temperature at or above 30 C (86 F) in 77 years, most in 2018 with 24.
  • 16 fixed thresholds have at least one qualifying day at Seattle.
77 years with a qualifying day
Days at or above 30 C (86 F) per year in Seattle Days per year in Seattle with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 24 in 2018. 01020301948: 31949: 41950: 31951: 71952: 91953: 31955: 31956: 71958: 161959: 91960: 121961: 141962: 41963: 71964: 11965: 101966: 31967: 201968: 91969: 41970: 51971: 121972: 91973: 61974: 151975: 91976: 31977: 151978: 111979: 81980: 11981: 121982: 81983: 11984: 41985: 141986: 101987: 101988: 121989: 31990: 141991: 61992: 141993: 31994: 71995: 71996: 141997: 51998: 91999: 22000: 22001: 32002: 62003: 122004: 82005: 102006: 142007: 52008: 92009: 202010: 102011: 12012: 82013: 152014: 172015: 232016: 142017: 202018: 242019: 82020: 122021: 142022: 202023: 172024: 152025: 172026: 1219481960197019801990200020102020
Days per year in Seattle with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 24 in 2018.
Days at or above 30 C (86 F) per year in Seattle
YearDaysDecade average
194833.5
194943.5
195037.1
195177.1
195297.1
195337.1
195537.1
195677.1
1958167.1
195997.1
1960128.4
1961148.4
196248.4
196378.4
196418.4
1965108.4
196638.4
1967208.4
196898.4
196948.4
197059.3
1971129.3
197299.3
197369.3
1974159.3
197599.3
197639.3
1977159.3
1978119.3
197989.3
198017.5
1981127.5
198287.5
198317.5
198447.5
1985147.5
1986107.5
1987107.5
1988127.5
198937.5
1990148.1
199168.1
1992148.1
199338.1
199478.1
199578.1
1996148.1
199758.1
199898.1
199928.1
200028.9
200138.9
200268.9
2003128.9
200488.9
2005108.9
2006148.9
200758.9
200898.9
2009208.9
20101014
2011114
2012814
20131514
20141714
20152314
20161414
20172014
20182414
2019814
20201215.3
20211415.3
20222015.3
20231715.3
20241515.3
20251715.3
20261215.3
First to last qualifying date each year in Seattle For each year, a bar from the first to the last day in Seattle meeting 30 C (86 F). 1948: 7 June 1948 to 31 July 19481949: 13 July 1949 to 6 September 19491950: 21 July 1950 to 21 September 19501951: 28 June 1951 to 15 September 19511952: 8 July 1952 to 21 September 19521953: 5 May 1953 to 5 September 19531955: 9 June 1955 to 5 September 19551956: 30 May 1956 to 6 September 19561958: 18 May 1958 to 7 September 19581959: 9 July 1959 to 31 July 19591960: 5 July 1960 to 9 August 19601961: 15 June 1961 to 13 September 19611962: 23 July 1962 to 28 July 19621963: 18 May 1963 to 9 September 19631964: 31 May 1964 to 31 May 19641965: 30 June 1965 to 18 August 19651966: 15 June 1966 to 21 August 19661967: 19 June 1967 to 27 September 19671968: 25 June 1968 to 10 August 19681969: 22 May 1969 to 17 June 19691970: 1 June 1970 to 15 July 19701971: 11 May 1971 to 11 August 19711972: 27 May 1972 to 8 August 19721973: 14 May 1973 to 5 September 19731974: 29 June 1974 to 24 September 19741975: 1 June 1975 to 22 September 19751976: 18 June 1976 to 20 September 19761977: 17 June 1977 to 17 August 19771978: 2 June 1978 to 8 August 19781979: 2 June 1979 to 14 September 19791980: 10 August 1980 to 10 August 19801981: 26 July 1981 to 15 September 19811982: 18 June 1982 to 2 September 19821983: 28 May 1983 to 28 May 19831984: 16 July 1984 to 14 September 19841985: 18 June 1985 to 23 August 19851986: 31 May 1986 to 6 September 19861987: 26 June 1987 to 1 October 19871988: 14 June 1988 to 3 September 19881989: 4 June 1989 to 22 September 19891990: 11 July 1990 to 22 September 19901991: 2 July 1991 to 21 August 19911992: 24 May 1992 to 17 August 19921993: 3 August 1993 to 5 August 19931994: 19 July 1994 to 22 September 19941995: 28 June 1995 to 19 July 19951996: 12 July 1996 to 29 August 19961997: 4 July 1997 to 17 August 19971998: 16 July 1998 to 1 September 19981999: 9 July 1999 to 13 September 19992000: 27 June 2000 to 28 June 20002001: 9 August 2001 to 12 August 20012002: 13 June 2002 to 28 August 20022003: 5 June 2003 to 4 September 20032004: 18 June 2004 to 9 August 20042005: 26 May 2005 to 15 August 20052006: 25 June 2006 to 2 September 20062007: 30 May 2007 to 29 August 20072008: 17 May 2008 to 16 August 20082009: 2 June 2009 to 22 September 20092010: 7 July 2010 to 25 August 20102011: 21 August 2011 to 21 August 20112012: 4 August 2012 to 7 September 20122013: 6 May 2013 to 11 September 20132014: 1 July 2014 to 15 September 20142015: 7 June 2015 to 19 August 20152016: 18 April 2016 to 26 August 20162017: 27 May 2017 to 28 September 20172018: 14 May 2018 to 22 August 20182019: 10 May 2019 to 28 August 20192020: 9 May 2020 to 10 September 20202021: 1 June 2021 to 13 August 20212022: 25 June 2022 to 16 October 20222023: 13 May 2023 to 2 September 20232024: 21 June 2024 to 6 September 20242025: 8 June 2025 to 16 September 20252026: 2 June 2026 to 20 August 202619481960197019801990200020102020JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Seattle meeting 30 C (86 F).
First to last qualifying date each year in Seattle
YearFirst dateLast date
19481948-06-071948-07-31
19491949-07-131949-09-06
19501950-07-211950-09-21
19511951-06-281951-09-15
19521952-07-081952-09-21
19531953-05-051953-09-05
19551955-06-091955-09-05
19561956-05-301956-09-06
19581958-05-181958-09-07
19591959-07-091959-07-31
19601960-07-051960-08-09
19611961-06-151961-09-13
19621962-07-231962-07-28
19631963-05-181963-09-09
19641964-05-311964-05-31
19651965-06-301965-08-18
19661966-06-151966-08-21
19671967-06-191967-09-27
19681968-06-251968-08-10
19691969-05-221969-06-17
19701970-06-011970-07-15
19711971-05-111971-08-11
19721972-05-271972-08-08
19731973-05-141973-09-05
19741974-06-291974-09-24
19751975-06-011975-09-22
19761976-06-181976-09-20
19771977-06-171977-08-17
19781978-06-021978-08-08
19791979-06-021979-09-14
19801980-08-101980-08-10
19811981-07-261981-09-15
19821982-06-181982-09-02
19831983-05-281983-05-28
19841984-07-161984-09-14
19851985-06-181985-08-23
19861986-05-311986-09-06
19871987-06-261987-10-01
19881988-06-141988-09-03
19891989-06-041989-09-22
19901990-07-111990-09-22
19911991-07-021991-08-21
19921992-05-241992-08-17
19931993-08-031993-08-05
19941994-07-191994-09-22
19951995-06-281995-07-19
19961996-07-121996-08-29
19971997-07-041997-08-17
19981998-07-161998-09-01
19991999-07-091999-09-13
20002000-06-272000-06-28
20012001-08-092001-08-12
20022002-06-132002-08-28
20032003-06-052003-09-04
20042004-06-182004-08-09
20052005-05-262005-08-15
20062006-06-252006-09-02
20072007-05-302007-08-29
20082008-05-172008-08-16
20092009-06-022009-09-22
20102010-07-072010-08-25
20112011-08-212011-08-21
20122012-08-042012-09-07
20132013-05-062013-09-11
20142014-07-012014-09-15
20152015-06-072015-08-19
20162016-04-182016-08-26
20172017-05-272017-09-28
20182018-05-142018-08-22
20192019-05-102019-08-28
20202020-05-092020-09-10
20212021-06-012021-08-13
20222022-06-252022-10-16
20232023-05-132023-09-02
20242024-06-212024-09-06
20252025-06-082025-09-16
20262026-06-022026-08-20

Every Fixed Threshold

Fixed thresholds in Seattle
ThresholdYears with a qualifying dayMost days in a yearYearLatest year daysPage
30 C (86 F): Days7724201812Full page
35 C (95 F): Days34419771Full page
40 C (104 F): Days1220212Too few years
90 F (32.2 C): Days641320224Full page
100 F (37.8 C): Days3320213Too few years
Ice days (max at or below 0 C) (32 F): Ice days (max462019503Full page
Frost days (min at or below 0 C) (32 F): Frost days (min7976198513Full page
-10 C (14 F): Days with min211619501Full page
Tropical nights (min at or above 20 C) (68 F): Tropical nights (min12420211Full page
Days with 10 mm or more rain (0.39 in): Days with 10 mm or more rain7947201423Full page
Days with 25 mm or more rain (0.98 in): Days with 25 mm or more rain781420154Full page
Days with 50 mm or more rain (1.97 in): Days with 50 mm or more rain28319861Full page
Days with 100 mm or more rain (3.94 in): Days with 100 mm or more rain1120031Too few years
Days with 10 cm or more snowfall (3.9 in): Days with 10 cm or more snowfall23419501Full page
Days with 25 cm or more snowfall (9.8 in): Days with 25 cm or more snowfall2219501Too few years
Days with 50 cm or more snowfall (19.7 in): Days with 50 cm or more snowfall1119501Too few years

A full page with streaks and every date exists for thresholds with at least 5 qualifying years. Years with under 90 percent of days observed are left out of the most days column.

Download the Data

  • Data for Seattle 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 2026-10-12 (12 October 2026). Threshold counts are computed by this site from the threaded city record.

Data as of . Last revised (2026-10-12).