Napa May 20 Weather Records

Daily averages and all-time records for weather in Napa, California for the date of May 20.
May 20 All-Time Records
1901–2024
Highest temperature 99 °F 1931
Lowest temperature 34 °F 1974
Lowest daily high 56 °F 1927
Highest daily low 70 °F 1931
Most precipitation 0.68 inches 1912
May 20 Average Weather
1991–2020 1
Average high 73.8 °F
Average low 48.0 °F
Chance precipitation 10.7%
Napa May 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 70 52 0.00 n/a
2022 83 50 0.00 n/a
2021 71 38 0.03 n/a
2020 72 43 0.00 n/a
2019 67 43 0.14 n/a
2018 n/a n/a 0.00 n/a
2017 87 49 0.00 n/a
2016 67 47 0.00 n/a
2015 68 48 0.00 n/a
2014 72 43 0.00 n/a
2013 91 51 0.00 n/a
2012 80 47 0.00 n/a
2011 68 52 0.00 n/a
2010 71 39 0.00 n/a
2009 70 40 0.00 n/a
2008 78 52 0.00 n/a
2007 80 45 0.00 n/a
2006 72 47 0.00 n/a
2005 72 44 0.00 n/a
2004 71 46 0.00 n/a
2003 85 44 0.00 n/a
2002 61 47 0.26 n/a
2001 89 47 0.00 n/a
2000 87 54 0.00 n/a
1999 65 47 0.00 n/a
1998 69 42 0.00 0.0
1997 80 53 0.00 0.0
1996 73 46 0.00 0.0
1995 80 51 0.00 0.0
1994 72 46 0.00 0.0
1993 73 61 0.01 0.0
1992 79 48 0.00 0.0
1991 72 43 0.00 0.0
1990 64 51 0.53 0.0
1989 76 47 0.00 0.0
1988 95 53 0.00 0.0
1987 69 51 0.00 0.0
1986 69 52 0.00 0.0
1985 78 48 0.00 0.0
1984 81 53 0.00 0.0
1983 90 58 0.00 0.0
1982 79 48 0.00 0.0
1981 72 43 0.00 0.0
1980 87 53 0.00 0.0
1979 n/a n/a n/a n/a
1978 90 51 0.00 0.0
1977 74 51 0.00 0.0
1976 76 41 0.00 0.0
1975 73 47 0.00 0.0
1974 67 34 0.00 0.0
1973 71 47 0.00 0.0
1972 64 47 0.00 0.0
1971 75 44 0.00 0.0
1970 73 41 0.00 0.0
1969 78 45 0.00 0.0
1968 74 57 0.00 0.0
1967 79 51 0.00 0.0
1966 75 49 0.00 0.0
1965 66 48 0.00 0.0
1964 74 49 0.00 0.0
1963 68 52 0.00 0.0
1962 72 42 0.00 0.0
1961 65 50 0.00 0.0
1960 82 50 0.00 0.0
1959 88 47 0.00 0.0
1958 73 52 0.00 0.0
1957 65 50 0.09 0.0
1956 79 43 0.00 0.0
1955 83 54 0.00 0.0
1954 80 48 0.00 0.0
1953 69 44 0.13 0.0
1952 88 50 0.00 0.0
1951 68 49 0.00 0.0
1950 90 46 0.00 0.0
1949 70 45 0.00 0.0
1948 60 48 0.08 n/a
1947 n/a n/a 0.00 n/a
1946 n/a n/a 0.00 n/a
1945 73 41 0.01 n/a
1944 84 47 0.00 n/a
1943 76 43 0.00 n/a
1942 94 55 0.00 n/a
1941 95 65 0.00 n/a
1940 72 54 0.00 n/a
1939 69 45 0.00 n/a
1938 70 45 0.00 n/a
1937 82 45 0.00 n/a
1936 77 40 0.00 n/a
1935 93 46 0.00 n/a
1934 82 43 0.00 n/a
1933 n/a n/a 0.00 n/a
1932 72 55 0.00 n/a
1931 99 70 0.00 n/a
1930 72 49 0.00 n/a
1929 68 48 0.00 n/a
1928 67 50 0.00 n/a
1927 56 40 0.07 n/a
1926 73 51 0.00 n/a
1925 67 57 0.16 n/a
1924 66 49 0.00 n/a
1923 63 48 0.00 n/a
1922 67 48 0.00 n/a
1921 63 45 0.11 n/a
1920 91 47 0.00 n/a
1919 78 53 0.00 n/a
1918 70 34 0.00 n/a
1917 77 38 0.00 n/a
1916 n/a n/a 0.00 n/a
1915 n/a n/a n/a n/a
1914 76 54 0.00 n/a
1913 71 50 0.00 n/a
1912 63 55 0.68 n/a
1911 86 56 0.00 0.0
1910 64 54 0.00 0.0
1909 68 43 0.00 n/a
1908 78 50 0.00 n/a
1907 70 46 0.00 n/a
1906 69 47 n/a n/a
1905 66 45 n/a n/a
1904 97 50 0.00 n/a
1903 70 39 0.00 n/a
1902 69 46 0.00 n/a
1901 60 42 0.00 n/a
What's the all-time high for Napa on 5/20?
For the date of May 20, the highest temperature ever reached in Napa history is 99 °F which happened in 1931.
Highest Temperatures in Napa on May 20
Rank Temperature Year
1 99 °F 1931
2 97 °F 1904
3 95 °F 1988
3 95 °F 1941
5 94 °F 1942
6 93 °F 1935
7 91 °F 1920
7 91 °F 2013
9 90 °F 1978
9 90 °F 1950
9 90 °F 1983
What's the all-time low for Napa on 5/20?
For the date of May 20, the lowest temperature ever reached in Napa history is 34 °F which has happened 2 times, most recently in 1974.
Lowest Temperatures in Napa on May 20
Rank Temperature Year
1 34 °F 1918
1 34 °F 1974
3 38 °F 2021
3 38 °F 1917
5 39 °F 2010
5 39 °F 1903
7 40 °F 2009
7 40 °F 1927
7 40 °F 1936
10 41 °F 1945
10 41 °F 1970
10 41 °F 1976
Lowest High Temperatures in Napa on May 20
Rank Temperature Year
1 56 °F 1927
2 60 °F 1901
2 60 °F 1948
4 61 °F 2002
5 63 °F 1923
5 63 °F 1912
5 63 °F 1921
8 64 °F 1990
8 64 °F 1910
8 64 °F 1972
What's the most it has ever rained in Napa on 5/20?
For the date of May 20, the most precipitation ever recorded in Napa history is 0.68 inches which happened in 1912.
All-Time Most Precipitation in Napa on May 20
Rank Precipitation Year
1 0.68 inches 1912
2 0.53 inches 1990
3 0.26 inches 2002
4 0.16 inches 1925
5 0.14 inches 2019
6 0.13 inches 1953
7 0.11 inches 1921
8 0.09 inches 1957
9 0.08 inches 1948
10 0.07 inches 1927
Weather Station Details
Years Station Coordinates
1999–2024 Napa County Airport location
1901–1998 Napa State Hospital location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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