All-time weather records — Vacaville, CA

Record high
115.0°F
July 10, 2021
Record low
17.1°F
December 23, 1998
Wettest day
4.50 in
December 13, 2002

Climate change signal in Vacaville

52.5%

of Vacaville's all-time daily heat records were set in the last decade (192 of 366 records since 2015).

36.3%

of all-time daily cold records were set in the last decade (133 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 #
1990s
12
63
2000s
116
96
2010s
125
149
2020s
113
58

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 1998, the latest in 2026. Period of observation: 1998-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 78.1°F — Jan 12, 2009 18.1°F — Jan 17, 2012 3.38 in — Jan 10, 2017
February 84.9°F — Feb 15, 2016 24.3°F — Feb 24, 2018 4.07 in — Feb 26, 2019
March 90.0°F — Mar 20, 2026 28.9°F — Mar 8, 2002 2.17 in — Mar 5, 2016
April 97.0°F — Apr 21, 2009 31.1°F — Apr 6, 2024 1.43 in — Apr 6, 2017
May 106.0°F — May 31, 2001 34.0°F — May 10, 2022 1.73 in — May 28, 1998
June 111.9°F — Jun 28, 2009 43.0°F — Jun 8, 1999 0.69 in — Jun 28, 2011
July 115.0°F — Jul 10, 2021 48.9°F — Jul 12, 2001 0.09 in — Jul 18, 2007
August 111.0°F — Aug 15, 2020 48.0°F — Aug 23, 2002 0.20 in — Aug 21, 2003
September 115.0°F — Sep 5, 2022 41.0°F — Sep 29, 2019 0.43 in — Sep 18, 2022
October 104.0°F — Oct 1, 2001 33.1°F — Oct 31, 2019 4.23 in — Oct 13, 2009
November 89.1°F — Nov 3, 2018 25.0°F — Nov 29, 2015 3.13 in — Nov 7, 2002
December 75.9°F — Dec 20, 1999 17.1°F — Dec 23, 1998 4.50 in — Dec 13, 2002

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