Napa, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 39° 57° 19° (1937) 85° (1962) 5.35" 0"
February 42° 62° 23° (1917) 85° (1948) 5.03" 0"
March 43° 65° 23° (1949) 90° (1955) 4.09" 0"
April 45° 71° 27° (1929) 95° (2004) 1.45" 0"
May 49° 75° 30° (1974) 103° (2001) 0.78" 0"
June 53° 81° 34° (1929) 113° (1961) 0.16" 0"
July 55° 83° 38° (1929) 112° (1972) 0.05" 0"
August 55° 82° 37° (1932) 106° (1998) 0.11" 0"
September 53° 82° 36° (1932) 109° (1955) 0.41" 0"
October 49° 76° 28° (1946) 106° (1980) 1.43" 0"
November 43° 64° 25° (1932) 89° (1929) 3.72" 0"
December 39° 57° 14° (1990) 81° (1967) 3.88" 0"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 47° 73° 35° (1917) 93° (1947) 0.03" NA
May 2 47° 73° 34° (1921) 93° (1966) 0.03" NA
May 3 47° 73° 32° (1950) 92° (1966) 0.03" NA
May 4 47° 73° 34° (1917) 92° (1990) 0.03" NA
May 5 47° 74° 32° (1950) 96° (1987) 0.03" NA
May 6 47° 74° 33° (1964) 96° (1987) 0.03" NA
May 7 47° 74° 34° (1930) 98° (1987) 0.03" NA
May 8 48° 74° 34° (1930) 97° (1931) 0.03" NA
May 9 48° 74° 32° (1918) 97° (1931) 0.03" NA
May 10 48° 74° 34° (1918) 94° (1941) 0.03" NA
May 11 48° 74° 34° (1976) 92° (2001) 0.03" NA
May 12 48° 75° 38° (1918) 103° (1976) 0.03" NA
May 13 48° 75° 38° (1943) 100° (1976) 0.03" NA
May 14 49° 75° 32° (1918) 96° (1976) 0.03" NA
May 15 49° 75° 34° (1917) 97° (1970) 0.03" NA
May 16 49° 75° 36° (1917) 99° (1956) 0.03" NA
May 17 49° 75° 37° (1919) 100° (1997) 0.03" NA
May 18 49° 76° 30° (1974) 100° (1997) 0.02" NA
May 19 49° 76° 36° (1939) 95° (1931) 0.02" NA
May 20 49° 76° 34° (1918) 99° (1931) 0.02" NA
May 21 50° 76° 37° (1930) 98° (2000) 0.02" NA
May 22 50° 76° 38° (1918) 96° (2000) 0.02" NA
May 23 50° 77° 36° (1949) 99° (1943) 0.02" NA
May 24 50° 77° 37° (1953) 102° (1982) 0.02" NA
May 25 50° 77° 37° (1953) 99° (1982) 0.02" NA
May 26 50° 77° 32° (1918) 95° (1932) 0.02" NA
May 27 50° 77° 37° (1918) 102° (1984) 0.02" NA
May 28 50° 78° 37° (1927) 98° (1984) 0.02" NA
May 29 51° 78° 39° (1927) 103° (1950) 0.02" NA
May 30 51° 78° 39° (1923) 102° (2001) 0.02" NA
May 31 51° 78° 39° (1923) 103° (2001) 0.01" NA
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