December weather in Napa, CA
The average temperature in Napa in December is 49.1°F (39.7°F–58.5°F). Average precipitation: 5.53 inches.
December is a winter month in Napa, and is cooler than the annual average of 60.3°F. Daily temperatures swing about 18.8°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 21m. For travel, December is a wet month.
Avg High
58.5°F
Avg Low
39.7°F
Precipitation
5.53 in
Daylight
9h 21m
December records in Napa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.0°F (1956) | 28.0°F (1932) | 2.30 in (1951) |
| December 2 | 75.0°F (1959) | 28.0°F (1928) | 1.92 in (2012) |
| December 3 | 75.0°F (1958) | 28.0°F (1936) | 2.41 in (1980) |
| December 4 | 73.9°F (1958) | 24.1°F (1936) | 2.00 in (1970) |
| December 5 | 75.9°F (1959) | 25.0°F (2013) | 2.05 in (1996) |
| December 6 | 73.9°F (1932) | 25.0°F (2013) | 1.78 in (1955) |
| December 7 | 73.9°F (1898) | 28.0°F (1972) | 1.75 in (1952) |
| December 8 | 79.0°F (1893) | 19.9°F (1932) | 1.88 in (2004) |
| December 9 | 72.0°F (1943) | 19.0°F (1932) | 2.34 in (1909) |
| December 10 | 75.0°F (1943) | 18.0°F (1932) | 2.02 in (1937) |
| December 11 | 75.9°F (1940) | 17.1°F (1932) | 3.24 in (2014) |
| December 12 | 75.0°F (1958) | 26.1°F (1931) | 3.45 in (1995) |
| December 13 | 72.0°F (1934) | 24.1°F (1919) | 2.60 in (1915) |
| December 14 | 73.0°F (1958) | 24.1°F (1932) | 2.70 in (2002) |
| December 15 | 71.1°F (1980) | 25.0°F (1932) | 2.59 in (2016) |
| December 16 | 72.0°F (1958) | 26.1°F (1928) | 2.27 in (2002) |
| December 17 | 75.9°F (1958) | 26.1°F (1924) | 1.36 in (1987) |
| December 18 | 68.0°F (1939) | 23.0°F (1924) | 1.93 in (2005) |
| December 19 | 75.9°F (1999) | 21.9°F (1924) | 2.85 in (1955) |
| December 20 | 75.9°F (1999) | 23.0°F (1990) | 2.15 in (1955) |
| December 21 | 73.9°F (1999) | 23.0°F (1990) | 2.25 in (1996) |
| December 22 | 70.0°F (1999) | 14.0°F (1990) | 3.45 in (1955) |
| December 23 | 70.0°F (1939) | 17.1°F (1990) | 2.12 in (1964) |
| December 24 | 73.0°F (1901) | 21.0°F (1990) | 2.45 in (1931) |
| December 25 | 72.0°F (1972) | 24.1°F (1990) | 1.65 in (1940) |
| December 26 | 81.0°F (1967) | 21.9°F (1924) | 1.46 in (1936) |
| December 27 | 75.0°F (1967) | 23.0°F (1918) | 4.10 in (1931) |
| December 28 | 75.0°F (1917) | 24.1°F (1918) | 1.98 in (1922) |
| December 29 | 71.1°F (1967) | 25.0°F (1918) | 2.10 in (2003) |
| December 30 | 71.1°F (1995) | 21.9°F (1990) | 2.12 in (1913) |
| December 31 | 73.9°F (1995) | 24.1°F (1990) | 3.98 in (2005) |