All-time weather records — Grass Valley, CA

Record high
108.0°F
July 15, 1972
Record low
3.0°F
December 9, 1972
Wettest day
9.05 in
October 25, 2021

Climate change signal in Grass Valley

22.7%

of Grass Valley's all-time daily heat records were set in the last decade (83 of 366 records since 2015).

4.1%

of all-time daily cold records were set in the last decade (15 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 #
1960s
41
28
1970s
79
120
1980s
80
122
1990s
24
41
2000s
49
25
2010s
37
21
2020s
56
9

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 1966, the latest in 2026. Period of observation: 1966-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 77.0°F — Jan 19, 1975 15.1°F — Jan 29, 1979 6.31 in — Jan 2, 1997
February 81.0°F — Feb 12, 1971 9.0°F — Feb 6, 1989 6.95 in — Feb 9, 2014
March 84.9°F — Mar 20, 2026 19.0°F — Mar 2, 1970 4.92 in — Mar 13, 1983
April 88.0°F — Apr 28, 1987 26.1°F — Apr 1, 1976 3.59 in — Apr 7, 2018
May 99.0°F — May 29, 1984 27.0°F — May 1, 1988 3.61 in — May 16, 1996
June 102.0°F — Jun 19, 2021 36.0°F — Jun 5, 1988 1.70 in — Jun 5, 2012
July 108.0°F — Jul 15, 1972 39.9°F — Jul 22, 1987 2.62 in — Jul 9, 1974
August 108.0°F — Aug 11, 1971 41.0°F — Aug 30, 1989 1.82 in — Aug 15, 1976
September 108.0°F — Sep 7, 2022 35.1°F — Sep 28, 1986 2.09 in — Sep 27, 1986
October 98.1°F — Oct 2, 2024 27.0°F — Oct 14, 1969 9.05 in — Oct 25, 2021
November 87.1°F — Nov 1, 1966 19.0°F — Nov 19, 1977 5.49 in — Nov 23, 1988
December 80.1°F — Dec 16, 1980 3.0°F — Dec 9, 1972 7.02 in — Dec 31, 2005

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