St. Helena Weather Records

St. Helena, California weather averages and records from 1907–2023 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in St. Helena, California was 115 °F which occurred on July 14, 1972.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in St. Helena, California was 11 °F which occurred on December 11, 1932.
Lowest Temperatures: All-Time By Year
St. Helena Weather by Month
Averages based on the years 1991–2020
Month Average (°F) Record (°F) Average (inches)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧 Snow ❄️
January 59.2 39.7 83 16 6.2 0.0
February 62.9 41.3 86 18 6.6 0.0
March 67.1 43.5 95 24 4.8 0.0
April 72.1 46.0 98 27 1.9 0.0
May 78.5 50.2 107 31 1.1 0.0
June 85.3 53.7 110 36 0.2 0.0
July 89.0 55.6 115 37 0.0 0.0
August 88.6 55.3 112 38 0.0 0.0
September 86.5 53.1 113 33 0.1 0.0
October 78.2 48.8 104 22 1.6 0.0
November 65.8 43.5 93 13 3.2 0.0
December 58.1 39.1 83 11 7.6 0.0
Entire year 74.5 47.7 115 11 31.6 0.0
More St. Helena Weather Records
1907–2023
Highest daily low 78 °F June 24, 1976
Lowest daily high 34 °F December 11, 1932
Greatest daily range
(Difference of high and low)		 63 °F August 31, 1955
Greatest difference in daily high
over two conscutive days		 36 °F May 9–10, 2017
Most daily precipitation 9.9 inches October 24, 2021
Most monthly precipitation 27.6 inches January 1909
Most yearly precipitation 75.4 inches 1983
Most yearly days with precipitation 118 2017
Earliest snow in season December 25 1948
Latest snow in season March 2 1976
Most daily snow 4.0 inches March 2, 1976
Most monthly snow 7.0 inches January 1916
Most yearly snow 7.0 inches 1916
Most snow in a winter 7.0 inches 1915–1916
Greatest snow accumulation 2.0 inches January 8, 1973
Earliest freeze October 2 2019
Earliest day ≥ 90 °F March 16 1914
Earliest day ≥ 100 °F May 5 1987
Latest freeze May 27 1918
Latest day ≥ 90 °F November 19 1936
Latest day ≥ 100 °F October 15 1961
Most days in a year < 32 °F 60 1949
Most days in a year ≥ 80 °F 180 1926
Most days in a year ≥ 90 °F 86 1939
Most days in a year ≥ 100 °F 26 1919
Most days in a year ≥ 110 °F 4 1921
St. Helena Weather Streaks
Most consecutive days...
With precipitation 28 days Jan 4–31, 2016
Without precipitation 228 days Apr 17 – Nov 30, 2019
High temperature ≥ 80 °F 113 days Jun 8 – Sep 28, 1926
High temperature ≥ 90 °F 25 days Jul 6–30, 2018
High temperature ≥ 100 °F 7 days Sep 4–10, 2022
High temperature ≥ 110 °F 3 days Jul 6–8, 1921
Plant Hardiness Zone
9B
St. Helena is in plant hardiness zone 9B
based on average yearly minimum temperature from 1991–2020
St. Helena Weather by Year
2023 2022 2021 2020 2019 2018 2017 2016 2015 2014
2013 2012 2011 2010 2009 2008 2007 2006 2005 2004
2003 2002 2001 2000 1999 1998 1997 1996 1995 1994
1993 1992 1991 1990 1989 1988 1987 1986 1985 1984
1983 1982 1981 1980 1979 1978 1977 1976 1975 1974
1973 1972 1971 1970 1969 1968 1967 1966 1965 1964
1963 1962 1961 1960 1959 1958 1957 1956 1955 1954
1953 1952 1951 1950 1949 1948 1947 1946 1945 1944
1943 1942 1941 1940 1939 1938 1937 1936 1935 1934
1933 1932 1931 1930 1929 1928 1927 1926 1925 1924
1923 1922 1921 1920 1919 1918 1917 1916 1915 1914
1913 1912 1911 1910 1909 1908 1907
More St. Helena Weather
Average Weather by Day
Record High by Day
Record Low by Day
Average Temperature by Year
Average Temperature by Month
Average Rainfall By Month
Recent Weather Records
Compare St. Helena to:
Weather Station Details
Years Station Coordinates
1907–2023 Saint Helena location
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