December weather in Grass Valley, CA
The average temperature in Grass Valley in December is 42.6°F (32.6°F–52.6°F). Average precipitation: 10.48 inches. Average snowfall is 1.2 inches.
December is a winter month in Grass Valley, and is cooler than the annual average of 56.1°F. Daily temperatures swing about 20°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 15m. For travel, December is a wet month.
Avg High
52.6°F
Avg Low
32.6°F
Precipitation
10.48 in
Snow
1.2 in
December records in Grass Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.0°F (2021) | 26.1°F (2004) | 3.25 in (1973) |
| December 2 | 75.0°F (2021) | 26.1°F (1967) | 4.16 in (2012) |
| December 3 | 71.1°F (2021) | 25.0°F (1978) | 2.01 in (2014) |
| December 4 | 70.0°F (1979) | 24.1°F (2013) | 4.56 in (1970) |
| December 5 | 70.0°F (1979) | 18.0°F (1972) | 4.73 in (1996) |
| December 6 | 73.0°F (1979) | 19.0°F (1978) | 1.94 in (2010) |
| December 7 | 72.0°F (1979) | 15.1°F (1978) | 3.03 in (2007) |
| December 8 | 71.1°F (2020) | 10.9°F (1972) | 2.41 in (2004) |
| December 9 | 70.0°F (1975) | 3.0°F (1972) | 3.93 in (1992) |
| December 10 | 69.1°F (1975) | 3.0°F (1972) | 4.19 in (2016) |
| December 11 | 66.9°F (2017) | 7.0°F (1972) | 2.70 in (2022) |
| December 12 | 73.0°F (2025) | 9.0°F (1972) | 4.43 in (1995) |
| December 13 | 73.0°F (2025) | 12.9°F (1972) | 1.92 in (2021) |
| December 14 | 72.0°F (2025) | 12.9°F (1972) | 3.86 in (2002) |
| December 15 | 70.0°F (2025) | 14.0°F (1972) | 3.65 in (1977) |
| December 16 | 80.1°F (1980) | 21.0°F (1967) | 3.90 in (2016) |
| December 17 | 78.1°F (1998) | 19.0°F (1967) | 1.75 in (2018) |
| December 18 | 72.0°F (1980) | 19.9°F (1984) | 3.60 in (2010) |
| December 19 | 68.0°F (1985) | 21.9°F (1992) | 3.70 in (1981) |
| December 20 | 69.1°F (2004) | 17.1°F (1990) | 5.31 in (1981) |
| December 21 | 70.0°F (1999) | 12.9°F (1990) | 4.62 in (1982) |
| December 22 | 73.0°F (1999) | 10.9°F (1990) | 3.65 in (2015) |
| December 23 | 70.0°F (1985) | 12.9°F (1990) | 2.40 in (1977) |
| December 24 | 70.0°F (1985) | 17.1°F (1998) | 4.54 in (1969) |
| December 25 | 73.0°F (1967) | 19.0°F (1990) | 3.32 in (1983) |
| December 26 | 77.0°F (1967) | 18.0°F (1988) | 2.86 in (2005) |
| December 27 | 73.0°F (1967) | 19.0°F (1988) | 3.49 in (1996) |
| December 28 | 73.9°F (1967) | 21.9°F (1990) | 2.47 in (2005) |
| December 29 | 71.1°F (1975) | 18.0°F (1990) | 2.98 in (1992) |
| December 30 | 69.1°F (1989) | 18.0°F (1990) | 2.67 in (1996) |
| December 31 | 68.0°F (1989) | 19.9°F (1978) | 7.02 in (2005) |