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Built 2026-10-19 (19 October 2026)

Seattle Boeing Fld Threshold Days by Year (USW00024234)

14 fixed thresholds counted per year at Seattle Boeing Fld (USW00024234): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Seattle Boeing Fld Thresholds

  • Seattle Boeing Fld: nights with a minimum temperature at or below 0 C (32 F) in 45 years, most in 1949 with 57.
  • Seattle Boeing Fld: days with 10 mm (0.39 in) or more of precipitation in 45 years, most in 1950 with 49.
  • Seattle Boeing Fld: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 2015 with 27.
  • Seattle Boeing Fld: days with 25 mm (0.98 in) or more of precipitation in 42 years, most in 2006 with 12.
  • 14 fixed thresholds have at least one qualifying day at Seattle Boeing Fld.
43 years with a qualifying day
Days at or above 30 C (86 F) per year at Seattle Boeing Fld Days per year at Seattle Boeing Fld with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2015. 01020301948: 31949: 51950: 71951: 91952: 101953: 71955: 31956: 81958: 241959: 121960: 131961: 131962: 71963: 61964: 51999: 22000: 32001: 12002: 92003: 152004: 112005: 102006: 82007: 22008: 62009: 192010: 102011: 12012: 42013: 132014: 212015: 272016: 72017: 172018: 202019: 52020: 92021: 112022: 142023: 102024: 172025: 152026: 9194819531960199920042009201420192024
Days per year at Seattle Boeing Fld with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2015.
Days at or above 30 C (86 F) per year at Seattle Boeing Fld
YearDaysDecade average
194834
194954
1950710
1951910
19521010
1953710
1955310
1956810
19582410
19591210
1960138.8
1961138.8
196278.8
196368.8
196458.8
199922
200038.4
200118.4
200298.4
2003158.4
2004118.4
2005108.4
200688.4
200728.4
200868.4
2009198.4
20101012.5
2011112.5
2012412.5
20131312.5
20142112.5
20152712.5
2016712.5
20171712.5
20182012.5
2019512.5
2020912.1
20211112.1
20221412.1
20231012.1
20241712.1
20251512.1
2026912.1
First to last qualifying date each year at Seattle Boeing Fld For each year, a bar from the first to the last day at Seattle Boeing Fld meeting 30 C (86 F). 1948: 7 June 1948 to 31 July 19481949: 5 June 1949 to 6 September 19491950: 3 June 1950 to 26 August 19501951: 25 June 1951 to 15 September 19511952: 8 July 1952 to 21 September 19521953: 4 May 1953 to 5 September 19531955: 8 June 1955 to 14 July 19551956: 17 May 1956 to 6 September 19561958: 18 May 1958 to 24 August 19581959: 1 June 1959 to 31 July 19591960: 5 July 1960 to 9 August 19601961: 19 May 1961 to 19 August 19611962: 22 July 1962 to 15 August 19621963: 19 May 1963 to 9 September 19631964: 31 May 1964 to 24 August 19641999: 12 June 1999 to 9 July 19992000: 27 June 2000 to 14 September 20002001: 10 August 2001 to 10 August 20012002: 13 June 2002 to 28 August 20022003: 6 June 2003 to 4 September 20032004: 17 June 2004 to 10 August 20042005: 26 May 2005 to 15 August 20052006: 25 June 2006 to 2 September 20062007: 10 July 2007 to 11 July 20072008: 17 May 2008 to 16 August 20082009: 2 June 2009 to 22 September 20092010: 7 July 2010 to 17 August 20102011: 21 August 2011 to 21 August 20112012: 4 August 2012 to 17 August 20122013: 6 May 2013 to 11 September 20132014: 1 May 2014 to 15 September 20142015: 7 June 2015 to 27 August 20152016: 18 April 2016 to 13 August 20162017: 24 June 2017 to 28 September 20172018: 17 June 2018 to 22 August 20182019: 12 June 2019 to 28 August 20192020: 9 May 2020 to 10 September 20202021: 2 June 2021 to 13 August 20212022: 26 June 2022 to 31 August 20222023: 14 May 2023 to 17 August 20232024: 21 June 2024 to 5 September 20242025: 8 June 2025 to 16 September 20252026: 2 June 2026 to 7 August 202619481955196220022008201420202026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Seattle Boeing Fld meeting 30 C (86 F).
First to last qualifying date each year at Seattle Boeing Fld
YearFirst dateLast date
19481948-06-071948-07-31
19491949-06-051949-09-06
19501950-06-031950-08-26
19511951-06-251951-09-15
19521952-07-081952-09-21
19531953-05-041953-09-05
19551955-06-081955-07-14
19561956-05-171956-09-06
19581958-05-181958-08-24
19591959-06-011959-07-31
19601960-07-051960-08-09
19611961-05-191961-08-19
19621962-07-221962-08-15
19631963-05-191963-09-09
19641964-05-311964-08-24
19991999-06-121999-07-09
20002000-06-272000-09-14
20012001-08-102001-08-10
20022002-06-132002-08-28
20032003-06-062003-09-04
20042004-06-172004-08-10
20052005-05-262005-08-15
20062006-06-252006-09-02
20072007-07-102007-07-11
20082008-05-172008-08-16
20092009-06-022009-09-22
20102010-07-072010-08-17
20112011-08-212011-08-21
20122012-08-042012-08-17
20132013-05-062013-09-11
20142014-05-012014-09-15
20152015-06-072015-08-27
20162016-04-182016-08-13
20172017-06-242017-09-28
20182018-06-172018-08-22
20192019-06-122019-08-28
20202020-05-092020-09-10
20212021-06-022021-08-13
20222022-06-262022-08-31
20232023-05-142023-08-17
20242024-06-212024-09-05
20252025-06-082025-09-16
20262026-06-022026-08-07

Every Fixed Threshold

Fixed thresholds at Seattle Boeing Fld
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days432720159
35 C (95 F): Days16319581
40 C (104 F): Days2120091
90 F (32.2 C): Days381220153
100 F (37.8 C): Days3119601
0 C (32 F): Ice days (max251719503
0 C (32 F): Frost days (min4557194916
-10 C (14 F): Days with min81419502
20 C (68 F): Tropical nights (min12520211
10 mm (0.39 in): Days with 10 mm or more rain4549195012
25 mm (0.98 in): Days with 25 mm or more rain421220061
50 mm (1.97 in): Days with 50 mm or more rain14119481
100 mm (3.94 in): Days with 100 mm or more rain2120031
10 cm (3.9 in): Days with 10 cm or more snowfall6319551

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

  • Data for Seattle Boeing Fld 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). Threshold counts are computed by this site.

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