All-time weather records — Clearlake, CA

Record high
114.1°F
June 30, 1977
Record low
6.1°F
December 22, 1990
Wettest day
6.47 in
January 9, 1995

Climate change signal in Clearlake

21%

of Clearlake's all-time daily heat records were set in the last decade (77 of 366 records since 2015).

1.4%

of all-time daily cold records were set in the last decade (5 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1950s
20
65
1960s
71
163
1970s
49
79
1980s
61
20
1990s
28
16
2000s
32
11
2010s
58
9
2020s
47
3

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1955, the latest in 2026. Period of observation: 1954-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 81.0°F — Jan 23, 2021 8.1°F — Jan 5, 1974 6.47 in — Jan 9, 1995
February 81.0°F — Feb 15, 1977 12.9°F — Feb 17, 1984 4.70 in — Feb 3, 1998
March 90.0°F — Mar 18, 2026 17.1°F — Mar 3, 1966 5.26 in — Mar 9, 1995
April 93.9°F — Apr 30, 1981 23.0°F — Apr 24, 1964 2.71 in — Apr 12, 2006
May 100.9°F — May 29, 1984 28.0°F — May 4, 1964 2.03 in — May 28, 1990
June 114.1°F — Jun 30, 1977 34.0°F — Jun 3, 1966 1.15 in — Jun 2, 1967
July 113.0°F — Jul 16, 1972 39.0°F — Jul 4, 1966 0.70 in — Jul 8, 1974
August 111.9°F — Aug 9, 1978 39.9°F — Aug 22, 1968 1.20 in — Aug 18, 1965
September 113.0°F — Sep 7, 2022 30.0°F — Sep 19, 1965 2.81 in — Sep 17, 1989
October 104.0°F — Oct 1, 2009 24.1°F — Oct 31, 1971 3.08 in — Oct 23, 1989
November 91.9°F — Nov 1, 1966 19.0°F — Nov 25, 1956 3.07 in — Nov 14, 1965
December 79.0°F — Dec 8, 2021 6.1°F — Dec 22, 1990 6.28 in — Dec 12, 1995

Click a month to see every daily record for that month in Clearlake.