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Built 2026-10-16 (16 October 2026)

County Line California Threshold Days by Year

10 fixed thresholds counted per year at County Line California (USR0000CCOU): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for County Line California Thresholds

  • County Line California: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 2001 with 133.
  • County Line California: days with a maximum temperature at or above 35 C (95 F) in 30 years, most in 2008 with 77.
  • County Line California: days with a maximum temperature at or above 90 F (32.2 C) in 30 years, most in 2001 with 110.
  • County Line California: days with a maximum temperature at or above 100 F (37.8 C) in 30 years, most in 2021 with 41.
  • 10 fixed thresholds have at least one qualifying day at County Line California.
30 years with a qualifying day
Days at or above 30 C (86 F) per year at County Line California Days per year at County Line California with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 133 in 2001. 0501001501996: 1091997: 1061998: 771999: 1132000: 1122001: 1332002: 1222003: 1312004: 1272005: 972006: 1202007: 1232008: 1292009: 1192010: 1022011: 1092012: 1272014: 1182015: 1052016: 1032017: 1122018: 942019: 932020: 1282021: 1202022: 1142023: 992024: 1162025: 1102026: 1091996199920022005200820112015201820212024
Days per year at County Line California with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 133 in 2001.
Days at or above 30 C (86 F) per year at County Line California
YearDaysDecade average
1996109101.3
1997106101.3
199877101.3
1999113101.3
2000112121.3
2001133121.3
2002122121.3
2003131121.3
2004127121.3
200597121.3
2006120121.3
2007123121.3
2008129121.3
2009119121.3
2010102107
2011109107
2012127107
2014118107
2015105107
2016103107
2017112107
201894107
201993107
2020128113.7
2021120113.7
2022114113.7
202399113.7
2024116113.7
2025110113.7
2026109113.7
First to last qualifying date each year at County Line California For each year, a bar from the first to the last day at County Line California meeting 30 C (86 F). 1996: 29 April 1996 to 11 October 19961997: 26 April 1997 to 18 October 19971998: 15 June 1998 to 20 September 19981999: 17 April 1999 to 21 October 19992000: 2 April 2000 to 8 October 20002001: 31 March 2001 to 19 October 20012002: 2 April 2002 to 14 October 20022003: 20 May 2003 to 28 October 20032004: 21 March 2004 to 15 October 20042005: 12 March 2005 to 17 October 20052006: 27 April 2006 to 23 October 20062007: 12 March 2007 to 24 October 20072008: 13 April 2008 to 28 October 20082009: 19 April 2009 to 2 October 20092010: 30 May 2010 to 16 October 20102011: 1 April 2011 to 18 October 20112012: 20 April 2012 to 21 November 20122014: 1 May 2014 to 13 October 20142015: 1 May 2015 to 14 October 20152016: 18 May 2016 to 9 October 20162017: 3 May 2017 to 29 October 20172018: 8 May 2018 to 28 September 20182019: 24 April 2019 to 25 October 20192020: 28 April 2020 to 2 November 20202021: 29 April 2021 to 4 October 20212022: 4 May 2022 to 21 October 20222023: 27 April 2023 to 20 October 20232024: 11 May 2024 to 10 October 20242025: 9 May 2025 to 27 September 20252026: 18 March 2026 to 9 October 202619962000200420082012201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at County Line California meeting 30 C (86 F).
First to last qualifying date each year at County Line California
YearFirst dateLast date
19961996-04-291996-10-11
19971997-04-261997-10-18
19981998-06-151998-09-20
19991999-04-171999-10-21
20002000-04-022000-10-08
20012001-03-312001-10-19
20022002-04-022002-10-14
20032003-05-202003-10-28
20042004-03-212004-10-15
20052005-03-122005-10-17
20062006-04-272006-10-23
20072007-03-122007-10-24
20082008-04-132008-10-28
20092009-04-192009-10-02
20102010-05-302010-10-16
20112011-04-012011-10-18
20122012-04-202012-11-21
20142014-05-012014-10-13
20152015-05-012015-10-14
20162016-05-182016-10-09
20172017-05-032017-10-29
20182018-05-082018-09-28
20192019-04-242019-10-25
20202020-04-282020-11-02
20212021-04-292021-10-04
20222022-05-042022-10-21
20232023-04-272023-10-20
20242024-05-112024-10-10
20252025-05-092025-09-27
20262026-03-182026-10-09

Every Fixed Threshold

Fixed thresholds at County Line California
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days301332001109
35 C (95 F): Days3077200850
40 C (104 F): Days281520033
45 C (113 F): Days3120021
90 F (32.2 C): Days30110200189
100 F (37.8 C): Days3041202110
110 F (43.3 C): Days12320062
0 C (32 F): Frost days (min303320083
20 C (68 F): Tropical nights (min3078202051
25 C (77 F): Days with min241720176

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1996.

Download the Data

  • Data for County Line 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).