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Built 2026-10-19 (19 October 2026)

Clear Lake Threshold Days by Year (USS0021D12S)

13 fixed thresholds counted per year at Clear Lake (USS0021D12S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Clear Lake Thresholds

  • Clear Lake: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1996 with 76.
  • Clear Lake: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1996 with 25.
  • Clear Lake: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 1991 with 91.
  • Clear Lake: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 1998 with 18.
  • 13 fixed thresholds have at least one qualifying day at Clear Lake.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Clear Lake Days per year at Clear Lake with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1998. 051015201986: 71987: 61988: 71990: 31992: 11994: 51995: 11996: 131997: 31998: 181999: 12000: 12001: 52002: 72003: 112004: 72005: 72006: 62007: 42008: 42009: 102010: 42011: 22012: 62013: 42014: 112015: 112016: 42017: 152018: 82019: 32020: 92021: 152022: 112025: 92026: 5198619921997200120052009201320172021
Days per year at Clear Lake with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1998.
Days at or above 30 C (86 F) per year at Clear Lake
YearDaysDecade average
198676.7
198766.7
198876.7
199035.6
199215.6
199455.6
199515.6
1996135.6
199735.6
1998185.6
199915.6
200016.2
200156.2
200276.2
2003116.2
200476.2
200576.2
200666.2
200746.2
200846.2
2009106.2
201046.8
201126.8
201266.8
201346.8
2014116.8
2015116.8
201646.8
2017156.8
201886.8
201936.8
202099.8
2021159.8
2022119.8
202599.8
202659.8
First to last qualifying date each year at Clear Lake For each year, a bar from the first to the last day at Clear Lake meeting 30 C (86 F). 1986: 30 May 1986 to 14 August 19861987: 14 June 1987 to 8 August 19871988: 20 July 1988 to 4 September 19881990: 15 July 1990 to 9 August 19901992: 13 August 1992 to 13 August 19921994: 16 July 1994 to 24 July 19941995: 3 September 1995 to 3 September 19951996: 8 July 1996 to 24 August 19961997: 20 July 1997 to 6 August 19971998: 22 July 1998 to 6 September 19981999: 27 July 1999 to 27 July 19992000: 30 July 2000 to 30 July 20002001: 23 May 2001 to 15 August 20012002: 26 June 2002 to 13 September 20022003: 10 July 2003 to 5 September 20032004: 24 July 2004 to 19 August 20042005: 18 July 2005 to 20 August 20052006: 26 June 2006 to 28 August 20062007: 4 July 2007 to 30 August 20072008: 29 June 2008 to 17 August 20082009: 17 July 2009 to 20 August 20092010: 9 July 2010 to 25 August 20102011: 21 August 2011 to 11 September 20112012: 8 July 2012 to 17 August 20122013: 30 June 2013 to 23 July 20132014: 8 July 2014 to 11 August 20142015: 7 June 2015 to 1 August 20152016: 5 June 2016 to 20 August 20162017: 25 June 2017 to 3 September 20172018: 16 July 2018 to 9 August 20182019: 5 August 2019 to 28 August 20192020: 20 July 2020 to 4 September 20202021: 21 June 2021 to 13 August 20212022: 27 June 2022 to 2 September 20222025: 9 June 2025 to 2 September 20252026: 22 July 2026 to 20 August 202619861994199920042009201420192026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Clear Lake meeting 30 C (86 F).
First to last qualifying date each year at Clear Lake
YearFirst dateLast date
19861986-05-301986-08-14
19871987-06-141987-08-08
19881988-07-201988-09-04
19901990-07-151990-08-09
19921992-08-131992-08-13
19941994-07-161994-07-24
19951995-09-031995-09-03
19961996-07-081996-08-24
19971997-07-201997-08-06
19981998-07-221998-09-06
19991999-07-271999-07-27
20002000-07-302000-07-30
20012001-05-232001-08-15
20022002-06-262002-09-13
20032003-07-102003-09-05
20042004-07-242004-08-19
20052005-07-182005-08-20
20062006-06-262006-08-28
20072007-07-042007-08-30
20082008-06-292008-08-17
20092009-07-172009-08-20
20102010-07-092010-08-25
20112011-08-212011-09-11
20122012-07-082012-08-17
20132013-06-302013-07-23
20142014-07-082014-08-11
20152015-06-072015-08-01
20162016-06-052016-08-20
20172017-06-252017-09-03
20182018-07-162018-08-09
20192019-08-052019-08-28
20202020-07-202020-09-04
20212021-06-212021-08-13
20222022-06-272022-09-02
20252025-06-092025-09-02
20262026-07-222026-08-20

Every Fixed Threshold

Fixed thresholds at Clear Lake
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days361819985
35 C (95 F): Days5320223
90 F (32.2 C): Days22919989
100 F (37.8 C): Days1120211
0 C (32 F): Ice days (max3891199120
0 C (32 F): Frost days (min33191201184
-10 C (14 F): Days with min292020144
-20 C (-4 F): Days with min6519902
20 C (68 F): Tropical nights (min5220062
10 mm (0.39 in): Days with 10 mm or more rain4676199616
25 mm (0.98 in): Days with 25 mm or more rain462519963
50 mm (1.97 in): Days with 50 mm or more rain26519941
100 mm (3.94 in): Days with 100 mm or more rain2119941

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1986.

Download the Data

  • Data for Clear Lake 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).