All-time weather records — Napa, CA

Record high
114.1°F
September 6, 2022
Record low
14.0°F
December 22, 1990
Wettest day
5.85 in
November 21, 1977

Climate change signal in Napa

10.9%

of Napa's all-time daily heat records were set in the last decade (40 of 366 records since 2015).

0.8%

of all-time daily cold records were set in the last decade (3 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 #
1890s
14
12
1900s
21
13
1910s
15
63
1920s
42
77
1930s
34
79
1940s
27
42
1950s
31
22
1960s
32
18
1970s
26
10
1980s
27
8
1990s
20
13
2000s
30
·
2010s
20
8
2020s
27
1

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 1893, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 84.9°F — Jan 8, 1962 19.0°F — Jan 9, 1937 5.69 in — Jan 4, 1982
February 86.0°F — Feb 18, 1899 19.9°F — Feb 1, 1996 4.30 in — Feb 8, 2014
March 91.9°F — Mar 17, 1914 23.0°F — Mar 8, 1949 3.30 in — Mar 14, 2003
April 95.0°F — Apr 21, 2009 27.0°F — Apr 22, 1929 2.66 in — Apr 1, 1996
May 104.0°F — May 30, 1910 30.0°F — May 18, 1974 1.85 in — May 16, 1996
June 113.0°F — Jun 14, 1961 34.0°F — Jun 17, 1929 1.22 in — Jun 2, 1967
July 111.9°F — Jul 14, 1972 37.9°F — Jul 13, 1929 0.81 in — Jul 8, 1974
August 109.9°F — Aug 1, 1900 37.0°F — Aug 17, 1932 0.84 in — Aug 11, 1965
September 114.1°F — Sep 6, 2022 36.0°F — Sep 22, 1932 1.98 in — Sep 23, 1904
October 106.0°F — Oct 1, 1980 28.0°F — Oct 29, 1946 5.35 in — Oct 24, 2021
November 90.0°F — Nov 16, 1895 25.0°F — Nov 4, 1932 5.85 in — Nov 21, 1977
December 81.0°F — Dec 26, 1967 14.0°F — Dec 22, 1990 4.10 in — Dec 27, 1931

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