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Built 2026-10-19 (19 October 2026)

Portland WFO Threshold Days by Year (USC00356750)

16 fixed thresholds counted per year at Portland WFO (USC00356750): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portland WFO Thresholds

  • Portland WFO: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 2021 with 48.
  • Portland WFO: days with a maximum temperature at or above 90 F (32.2 C) in 30 years, most in 2018 with 32.
  • Portland WFO: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 2009 with 54.
  • Portland WFO: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 2012 with 53.
  • 16 fixed thresholds have at least one qualifying day at Portland WFO.
30 years with a qualifying day
Days at or above 30 C (86 F) per year at Portland WFO Days per year at Portland WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 48 in 2021. 02040601997: 291998: 291999: 262000: 232001: 202002: 302003: 422004: 352005: 272006: 292007: 262008: 302009: 372010: 202011: 192012: 242013: 262014: 432015: 472016: 342017: 472018: 452019: 222020: 352021: 482022: 442023: 452024: 432025: 412026: 341997200020032006200920122015201820212024
Days per year at Portland WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 48 in 2021.
Days at or above 30 C (86 F) per year at Portland WFO
YearDaysDecade average
19972928
19982928
19992628
20002329.9
20012029.9
20023029.9
20034229.9
20043529.9
20052729.9
20062929.9
20072629.9
20083029.9
20093729.9
20102032.7
20111932.7
20122432.7
20132632.7
20144332.7
20154732.7
20163432.7
20174732.7
20184532.7
20192232.7
20203541.4
20214841.4
20224441.4
20234541.4
20244341.4
20254141.4
20263441.4
First to last qualifying date each year at Portland WFO For each year, a bar from the first to the last day at Portland WFO meeting 30 C (86 F). 1997: 11 May 1997 to 24 September 19971998: 29 April 1998 to 15 September 19981999: 23 May 1999 to 22 September 19992000: 3 June 2000 to 14 September 20002001: 21 May 2001 to 12 September 20012002: 13 June 2002 to 24 September 20022003: 24 May 2003 to 28 September 20032004: 27 April 2004 to 1 September 20042005: 27 May 2005 to 27 August 20052006: 25 June 2006 to 4 September 20062007: 15 May 2007 to 11 September 20072008: 15 May 2008 to 29 September 20082009: 28 May 2009 to 23 September 20092010: 6 July 2010 to 27 September 20102011: 4 June 2011 to 11 September 20112012: 13 May 2012 to 18 September 20122013: 5 May 2013 to 11 September 20132014: 1 May 2014 to 21 September 20142015: 28 May 2015 to 12 September 20152016: 18 April 2016 to 26 September 20162017: 4 May 2017 to 28 September 20172018: 25 April 2018 to 6 September 20182019: 10 May 2019 to 5 September 20192020: 9 May 2020 to 9 September 20202021: 31 May 2021 to 24 September 20212022: 25 June 2022 to 2 October 20222023: 28 April 2023 to 15 September 20232024: 10 May 2024 to 24 September 20242025: 30 May 2025 to 23 September 20252026: 3 May 2026 to 17 September 202619972001200520092013201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Portland WFO meeting 30 C (86 F).
First to last qualifying date each year at Portland WFO
YearFirst dateLast date
19971997-05-111997-09-24
19981998-04-291998-09-15
19991999-05-231999-09-22
20002000-06-032000-09-14
20012001-05-212001-09-12
20022002-06-132002-09-24
20032003-05-242003-09-28
20042004-04-272004-09-01
20052005-05-272005-08-27
20062006-06-252006-09-04
20072007-05-152007-09-11
20082008-05-152008-09-29
20092009-05-282009-09-23
20102010-07-062010-09-27
20112011-06-042011-09-11
20122012-05-132012-09-18
20132013-05-052013-09-11
20142014-05-012014-09-21
20152015-05-282015-09-12
20162016-04-182016-09-26
20172017-05-042017-09-28
20182018-04-252018-09-06
20192019-05-102019-09-05
20202020-05-092020-09-09
20212021-05-312021-09-24
20222022-06-252022-10-02
20232023-04-282023-09-15
20242024-05-102024-09-24
20252025-05-302025-09-23
20262026-05-032026-09-17

Every Fixed Threshold

Fixed thresholds at Portland WFO
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3048202134
35 C (95 F): Days291420157
40 C (104 F): Days6320211
45 C (113 F): Days1120211
90 F (32.2 C): Days3032201821
100 F (37.8 C): Days18520211
110 F (43.3 C): Days1220212
0 C (32 F): Ice days (max191020171
0 C (32 F): Frost days (min3054200911
-10 C (14 F): Days with min2220242
20 C (68 F): Tropical nights (min11420211
10 mm (0.39 in): Days with 10 mm or more rain3053201213
25 mm (0.98 in): Days with 25 mm or more rain29919993
50 mm (1.97 in): Days with 50 mm or more rain11320151
10 cm (3.9 in): Days with 10 cm or more snowfall7220081
25 cm (9.8 in): Days with 25 cm or more snowfall1120231

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1997.

Download the Data

  • Data for Portland WFO 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).