December weather in Fairfax, CA
The average temperature in Fairfax in December is 49.6°F (42.1°F–57.1°F). Average precipitation: 7.81 inches.
December is a winter month in Fairfax, and is cooler than the annual average of 59.5°F. Daily temperatures swing about 15°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 22m. For travel, December is a wet month.
Avg High
57.1°F
Avg Low
42.1°F
Precipitation
7.81 in
Daylight
9h 22m
December records in Fairfax
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 72.0°F (1894) | 34.0°F (1895) | 4.52 in (2001) |
| December 2 | 78.1°F (1979) | 32.0°F (2022) | 2.77 in (1966) |
| December 3 | 75.0°F (1958) | 32.0°F (1903) | 4.87 in (1950) |
| December 4 | 75.0°F (1958) | 32.0°F (2004) | 3.17 in (1970) |
| December 5 | 73.9°F (1959) | 30.0°F (2013) | 2.59 in (1966) |
| December 6 | 71.1°F (1979) | 30.0°F (2013) | 2.22 in (1955) |
| December 7 | 70.0°F (1979) | 33.1°F (1956) | 5.74 in (1952) |
| December 8 | 69.1°F (1988) | 28.0°F (1972) | 1.51 in (1950) |
| December 9 | 77.0°F (1979) | 23.0°F (1972) | 3.19 in (1894) |
| December 10 | 70.0°F (1958) | 23.0°F (1972) | 2.56 in (1996) |
| December 11 | 73.0°F (1958) | 24.1°F (1972) | 8.74 in (1995) |
| December 12 | 75.0°F (1958) | 24.1°F (1972) | 3.22 in (1995) |
| December 13 | 69.1°F (1950) | 21.9°F (1997) | 6.24 in (2002) |
| December 14 | 70.0°F (1958) | 23.0°F (1992) | 2.17 in (2024) |
| December 15 | 73.0°F (1980) | 30.0°F (1992) | 3.67 in (2016) |
| December 16 | 73.9°F (1980) | 30.9°F (1965) | 2.45 in (2002) |
| December 17 | 73.0°F (1958) | 30.0°F (2008) | 1.72 in (1977) |
| December 18 | 69.1°F (1958) | 8.1°F (1992) | 3.97 in (2005) |
| December 19 | 75.9°F (1999) | 32.0°F (1992) | 4.78 in (1955) |
| December 20 | 68.0°F (1999) | 30.9°F (1990) | 3.86 in (1969) |
| December 21 | 69.1°F (2014) | 24.1°F (1990) | 2.29 in (1894) |
| December 22 | 71.1°F (2023) | 19.9°F (1990) | 3.90 in (1955) |
| December 23 | 66.9°F (2014) | 21.9°F (1990) | 4.82 in (1955) |
| December 24 | 66.0°F (2013) | 27.0°F (1990) | 2.76 in (1968) |
| December 25 | 69.1°F (1959) | 28.0°F (1895) | 1.26 in (2012) |
| December 26 | 79.0°F (1967) | 28.9°F (1895) | 1.72 in (1955) |
| December 27 | 78.1°F (1967) | 28.9°F (1895) | 1.67 in (2022) |
| December 28 | 78.1°F (1967) | 28.9°F (1894) | 2.40 in (1968) |
| December 29 | 75.0°F (1967) | 26.1°F (1895) | 3.61 in (2003) |
| December 30 | 69.1°F (1967) | 26.1°F (1895) | 2.33 in (1976) |
| December 31 | 66.0°F (1966) | 27.0°F (1895) | 2.80 in (2005) |