All-time weather records — Portola, CA

Record high
111.0°F
June 24, 2006
Record low
-27.9°F
December 9, 1972
Wettest day
5.67 in
October 25, 2021

Climate change signal in Portola

10.7%

of Portola's all-time daily heat records were set in the last decade (39 of 366 records since 2015).

1.1%

of all-time daily cold records were set in the last decade (4 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 #
1910s
29
59
1920s
105
115
1930s
43
47
1940s
22
33
1950s
28
30
1960s
18
28
1970s
16
17
1980s
25
10
1990s
12
13
2000s
19
4
2010s
27
9
2020s
22
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 1915, the latest in 2025. Period of observation: 1915-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 71.1°F — Jan 25, 1923 -24.0°F — Jan 1, 1924 3.57 in — Jan 21, 1967
February 72.0°F — Feb 28, 1986 -20.9°F — Feb 12, 1949 2.60 in — Feb 10, 2017
March 84.0°F — Mar 20, 1926 -11.9°F — Mar 20, 1952 3.61 in — Mar 10, 1995
April 86.0°F — Apr 30, 1947 3.0°F — Apr 13, 1921 2.10 in — Apr 8, 2017
May 93.9°F — May 29, 2003 5.0°F — May 8, 1983 2.40 in — May 16, 1996
June 111.0°F — Jun 24, 2006 19.9°F — Jun 2, 1929 1.12 in — Jun 1, 1961
July 109.9°F — Jul 1, 1924 21.9°F — Jul 1, 1976 1.86 in — Jul 11, 2001
August 107.1°F — Aug 8, 1981 19.0°F — Aug 19, 1943 2.02 in — Aug 20, 1990
September 100.0°F — Sep 2, 1955 12.0°F — Sep 25, 1929 1.10 in — Sep 11, 1976
October 91.9°F — Oct 1, 1980 3.0°F — Oct 29, 1919 5.67 in — Oct 25, 2021
November 82.0°F — Nov 3, 1918 -6.0°F — Nov 11, 1915 2.85 in — Nov 17, 1983
December 72.0°F — Dec 8, 1921 -27.9°F — Dec 9, 1972 4.18 in — Dec 19, 1955

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