December weather in Fairfield, CA
The average temperature in Fairfield in December is 48.4°F (40.1°F–56.7°F). Average precipitation: 5.40 inches.
December is a winter month in Fairfield, and is cooler than the annual average of 61.7°F. Daily temperatures swing about 16.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 21m. For travel, December is a wet month.
Avg High
56.7°F
Avg Low
40.1°F
Precipitation
5.40 in
Daylight
9h 21m
December records in Fairfield
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 78.1°F (1977) | 28.9°F (1957) | 2.32 in (2019) |
| December 2 | 75.9°F (2011) | 21.9°F (2025) | 2.00 in (2001) |
| December 3 | 73.0°F (1959) | 30.0°F (1956) | 2.43 in (1951) |
| December 4 | 72.0°F (1958) | 28.9°F (2004) | 1.98 in (1974) |
| December 5 | 72.0°F (1977) | 27.0°F (1972) | 1.37 in (1996) |
| December 6 | 73.0°F (1989) | 28.0°F (1959) | 1.65 in (1955) |
| December 7 | 73.9°F (2020) | 26.1°F (1956) | 1.38 in (1952) |
| December 8 | 72.0°F (1979) | 24.1°F (1978) | 1.97 in (2004) |
| December 9 | 69.1°F (1979) | 19.0°F (1972) | 2.45 in (1992) |
| December 10 | 70.0°F (1958) | 21.9°F (1972) | 1.46 in (1996) |
| December 11 | 73.0°F (1958) | 21.9°F (1972) | 2.97 in (1995) |
| December 12 | 75.0°F (1958) | 19.0°F (1985) | 4.41 in (1995) |
| December 13 | 70.0°F (1958) | 18.0°F (1985) | 3.30 in (2021) |
| December 14 | 70.0°F (1958) | 19.9°F (1985) | 5.58 in (2002) |
| December 15 | 71.1°F (1958) | 21.0°F (1985) | 2.51 in (2016) |
| December 16 | 71.1°F (1958) | 21.0°F (1985) | 1.64 in (2002) |
| December 17 | 70.0°F (1958) | 24.1°F (1985) | 1.11 in (1977) |
| December 18 | 69.1°F (1996) | 24.1°F (1985) | 3.00 in (2005) |
| December 19 | 66.0°F (2000) | 25.0°F (1965) | 3.00 in (1955) |
| December 20 | 77.0°F (1999) | 23.0°F (1965) | 2.42 in (1969) |
| December 21 | 71.1°F (1953) | 21.9°F (1965) | 1.46 in (2015) |
| December 22 | 73.9°F (2004) | 17.1°F (1990) | 1.67 in (1955) |
| December 23 | 73.0°F (2004) | 19.0°F (1990) | 2.70 in (1955) |
| December 24 | 66.0°F (2004) | 21.0°F (1990) | 2.80 in (1979) |
| December 25 | 68.0°F (1956) | 15.1°F (2011) | 2.18 in (1983) |
| December 26 | 70.0°F (1967) | 21.9°F (2011) | 1.79 in (2022) |
| December 27 | 75.9°F (1953) | 24.1°F (1956) | 2.21 in (2022) |
| December 28 | 73.9°F (1967) | 25.0°F (1962) | 1.41 in (2005) |
| December 29 | 70.0°F (1967) | 26.1°F (1962) | 2.05 in (2001) |
| December 30 | 68.0°F (1953) | 24.1°F (1990) | 1.95 in (2003) |
| December 31 | 70.0°F (1953) | 19.9°F (1978) | 5.20 in (2005) |