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Built 2026-10-16 (16 October 2026)

Santa Rosa California Threshold Days by Year

9 fixed thresholds counted per year at Santa Rosa California (USR0000CSRS): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Santa Rosa California Thresholds

  • Santa Rosa California: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 2004 with 69.
  • Santa Rosa California: days with a maximum temperature at or above 90 F (32.2 C) in 35 years, most in 2020 with 41.
  • Santa Rosa California: days with a maximum temperature at or above 35 C (95 F) in 33 years, most in 2003 with 18.
  • Santa Rosa California: days with a maximum temperature at or above 100 F (37.8 C) in 22 years, most in 2006 with 9.
  • 9 fixed thresholds have at least one qualifying day at Santa Rosa California.
35 years with a qualifying day
Days at or above 30 C (86 F) per year at Santa Rosa California Days per year at Santa Rosa California with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2004. 0204060801992: 201993: 391994: 211995: 271996: 561997: 321998: 331999: 332000: 482001: 572002: 462003: 682004: 692005: 252006: 572007: 402008: 682009: 432010: 262011: 272012: 362013: 272014: 382015: 502016: 432017: 522018: 372019: 462020: 632021: 442022: 452023: 302024: 612025: 292026: 40199219962000200420082012201620202024
Days per year at Santa Rosa California with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2004.
Days at or above 30 C (86 F) per year at Santa Rosa California
YearDaysDecade average
19922032.6
19933932.6
19942132.6
19952732.6
19965632.6
19973232.6
19983332.6
19993332.6
20004852.1
20015752.1
20024652.1
20036852.1
20046952.1
20052552.1
20065752.1
20074052.1
20086852.1
20094352.1
20102638.2
20112738.2
20123638.2
20132738.2
20143838.2
20155038.2
20164338.2
20175238.2
20183738.2
20194638.2
20206344.6
20214444.6
20224544.6
20233044.6
20246144.6
20252944.6
20264044.6
First to last qualifying date each year at Santa Rosa California For each year, a bar from the first to the last day at Santa Rosa California meeting 30 C (86 F). 1992: 9 May 1992 to 9 October 19921993: 14 June 1993 to 27 October 19931994: 9 June 1994 to 8 October 19941995: 22 June 1995 to 14 October 19951996: 28 April 1996 to 8 October 19961997: 16 May 1997 to 16 October 19971998: 15 June 1998 to 21 October 19981999: 27 June 1999 to 21 October 19992000: 1 April 2000 to 1 October 20002001: 6 May 2001 to 15 October 20012002: 29 May 2002 to 8 October 20022003: 20 May 2003 to 28 October 20032004: 15 March 2004 to 14 October 20042005: 10 March 2005 to 17 October 20052006: 10 May 2006 to 23 October 20062007: 6 May 2007 to 24 October 20072008: 11 April 2008 to 14 November 20082009: 19 April 2009 to 27 September 20092010: 12 June 2010 to 15 October 20102011: 4 May 2011 to 14 October 20112012: 31 May 2012 to 18 October 20122013: 22 April 2013 to 19 September 20132014: 29 April 2014 to 13 October 20142015: 27 April 2015 to 30 October 20152016: 6 April 2016 to 9 October 20162017: 1 May 2017 to 27 October 20172018: 28 May 2018 to 1 November 20182019: 23 April 2019 to 25 October 20192020: 25 April 2020 to 20 October 20202021: 18 April 2021 to 4 October 20212022: 22 March 2022 to 19 October 20222023: 27 April 2023 to 19 October 20232024: 10 May 2024 to 8 October 20242025: 9 May 2025 to 7 October 20252026: 16 March 2026 to 8 October 20261992199720022007201220172022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Santa Rosa California meeting 30 C (86 F).
First to last qualifying date each year at Santa Rosa California
YearFirst dateLast date
19921992-05-091992-10-09
19931993-06-141993-10-27
19941994-06-091994-10-08
19951995-06-221995-10-14
19961996-04-281996-10-08
19971997-05-161997-10-16
19981998-06-151998-10-21
19991999-06-271999-10-21
20002000-04-012000-10-01
20012001-05-062001-10-15
20022002-05-292002-10-08
20032003-05-202003-10-28
20042004-03-152004-10-14
20052005-03-102005-10-17
20062006-05-102006-10-23
20072007-05-062007-10-24
20082008-04-112008-11-14
20092009-04-192009-09-27
20102010-06-122010-10-15
20112011-05-042011-10-14
20122012-05-312012-10-18
20132013-04-222013-09-19
20142014-04-292014-10-13
20152015-04-272015-10-30
20162016-04-062016-10-09
20172017-05-012017-10-27
20182018-05-282018-11-01
20192019-04-232019-10-25
20202020-04-252020-10-20
20212021-04-182021-10-04
20222022-03-222022-10-19
20232023-04-272023-10-19
20242024-05-102024-10-08
20252025-05-092025-10-07
20262026-03-162026-10-08

Every Fixed Threshold

Fixed thresholds at Santa Rosa California
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3569200440
35 C (95 F): Days331820036
40 C (104 F): Days9320061
90 F (32.2 C): Days3541202025
100 F (37.8 C): Days22920061
110 F (43.3 C): Days4220201
0 C (32 F): Frost days (min211019931
20 C (68 F): Tropical nights (min21920191
25 C (77 F): Days with min1120171

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1992.

Download the Data

  • Data for Santa Rosa California 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-14).