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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Eureka AP Threshold Days by Year (USW00003170)

12 fixed thresholds counted per year at Eureka AP (USW00003170): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Eureka AP Thresholds

  • Eureka AP: days with a maximum temperature at or above 30 C (86 F) in 28 years, most in 2020 with 94.
  • Eureka AP: days with a maximum temperature at or above 35 C (95 F) in 28 years, most in 2021 with 27.
  • Eureka AP: days with a maximum temperature at or above 90 F (32.2 C) in 28 years, most in 2020 with 67.
  • Eureka AP: days with a maximum temperature at or below 0 C (32 F) in 28 years, most in 2004 with 40.
  • 12 fixed thresholds have at least one qualifying day at Eureka AP.
28 years with a qualifying day
Days at or above 30 C (86 F) per year at Eureka AP Days per year at Eureka AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 94 in 2020. 02550751001998: 561999: 532000: 742001: 762002: 682003: 812004: 572005: 642006: 782007: 872008: 812009: 662010: 722011: 752012: 812013: 742014: 702015: 752016: 802017: 792018: 872019: 602020: 942021: 852022: 792023: 512024: 932025: 791998200120042007201020132016201920222025
Days per year at Eureka AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 94 in 2020.
Days at or above 30 C (86 F) per year at Eureka AP
YearDaysDecade average
19985654.5
19995354.5
20007473.2
20017673.2
20026873.2
20038173.2
20045773.2
20056473.2
20067873.2
20078773.2
20088173.2
20096673.2
20107275.3
20117575.3
20128175.3
20137475.3
20147075.3
20157575.3
20168075.3
20177975.3
20188775.3
20196075.3
20209480.2
20218580.2
20227980.2
20235180.2
20249380.2
20257980.2
First to last qualifying date each year at Eureka AP For each year, a bar from the first to the last day at Eureka AP meeting 30 C (86 F). 1998: 28 June 1998 to 3 September 19981999: 14 June 1999 to 9 September 19992000: 22 May 2000 to 16 September 20002001: 23 May 2001 to 25 September 20012002: 29 May 2002 to 14 September 20022003: 23 May 2003 to 29 September 20032004: 4 May 2004 to 11 September 20042005: 20 June 2005 to 6 September 20052006: 1 June 2006 to 13 September 20062007: 27 May 2007 to 12 September 20072008: 17 May 2008 to 16 September 20082009: 17 May 2009 to 28 September 20092010: 5 June 2010 to 2 October 20102011: 15 June 2011 to 30 September 20112012: 22 April 2012 to 8 September 20122013: 13 May 2013 to 6 September 20132014: 26 May 2014 to 18 September 20142015: 30 May 2015 to 26 September 20152016: 3 June 2016 to 19 September 20162017: 3 June 2017 to 11 September 20172018: 8 May 2018 to 28 September 20182019: 28 June 2019 to 15 September 20192020: 29 April 2020 to 24 September 20202021: 30 April 2021 to 15 September 20212022: 26 May 2022 to 11 September 20222023: 1 July 2023 to 31 August 20232024: 5 June 2024 to 3 October 20242025: 28 May 2025 to 2 September 20251998200220062010201420182022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Eureka AP meeting 30 C (86 F).
First to last qualifying date each year at Eureka AP
YearFirst dateLast date
19981998-06-281998-09-03
19991999-06-141999-09-09
20002000-05-222000-09-16
20012001-05-232001-09-25
20022002-05-292002-09-14
20032003-05-232003-09-29
20042004-05-042004-09-11
20052005-06-202005-09-06
20062006-06-012006-09-13
20072007-05-272007-09-12
20082008-05-172008-09-16
20092009-05-172009-09-28
20102010-06-052010-10-02
20112011-06-152011-09-30
20122012-04-222012-09-08
20132013-05-132013-09-06
20142014-05-262014-09-18
20152015-05-302015-09-26
20162016-06-032016-09-19
20172017-06-032017-09-11
20182018-05-082018-09-28
20192019-06-282019-09-15
20202020-04-292020-09-24
20212021-04-302021-09-15
20222022-05-262022-09-11
20232023-07-012023-08-31
20242024-06-052024-10-03
20252025-05-282025-09-02

Every Fixed Threshold

Fixed thresholds at Eureka AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2894202079
35 C (95 F): Days282720218
90 F (32.2 C): Days2867202047
100 F (37.8 C): Days16520024
0 C (32 F): Ice days (max284020046
0 C (32 F): Frost days (min282281999193
-10 C (14 F): Days with min2884200936
-20 C (-4 F): Days with min252220131
-30 C (-22 F): Days with min3220021
20 C (68 F): Tropical nights (min1120151
10 mm (0.39 in): Days with 10 mm or more rain261020173
25 mm (0.98 in): Days with 25 mm or more rain4119981

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1998.

Download the Data

  • Data for Eureka AP 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 (2025-12-31).