December weather in Grass Valley, OR
The average temperature in Grass Valley in December is 31.8°F (24.2°F–39.5°F). Average precipitation: 1.61 inches. Average snowfall is 5.7 inches.
December is a winter month in Grass Valley, and is cooler than the annual average of 49°F. Daily temperatures swing about 15.3°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 8h 33m. For travel, December is cold.
Avg High
39.5°F
Avg Low
24.2°F
Precipitation
1.61 in
Snow
5.7 in
December records in Grass Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1994) | -5.1°F (1985) | 0.50 in (1942) |
| December 2 | 62.1°F (2021) | 1.0°F (1985) | 0.72 in (1962) |
| December 3 | 62.1°F (1918) | 5.0°F (1985) | 0.50 in (1922) |
| December 4 | 63.0°F (1939) | 3.0°F (1992) | 0.61 in (1943) |
| December 5 | 63.0°F (1989) | -2.9°F (1972) | 0.74 in (1996) |
| December 6 | 55.9°F (1925) | 5.0°F (1956) | 1.31 in (1923) |
| December 7 | 62.1°F (1938) | -2.9°F (2013) | 0.56 in (1973) |
| December 8 | 57.9°F (2015) | -16.1°F (1972) | 0.67 in (1929) |
| December 9 | 64.9°F (2015) | -15.0°F (1972) | 0.53 in (1987) |
| December 10 | 59.0°F (1987) | -11.9°F (1972) | 0.75 in (1937) |
| December 11 | 60.1°F (1955) | -11.0°F (1972) | 0.49 in (1977) |
| December 12 | 60.1°F (2014) | -18.0°F (1919) | 1.40 in (2022) |
| December 13 | 60.1°F (1917) | -20.0°F (1919) | 0.86 in (1977) |
| December 14 | 59.0°F (1953) | -18.9°F (1919) | 0.52 in (1950) |
| December 15 | 63.0°F (2002) | -14.1°F (1919) | 1.01 in (1981) |
| December 16 | 61.0°F (1939) | -5.1°F (1922) | 0.45 in (1982) |
| December 17 | 59.0°F (1917) | -11.0°F (1964) | 0.52 in (2018) |
| December 18 | 60.1°F (1917) | -9.0°F (1964) | 1.46 in (1929) |
| December 19 | 57.0°F (1941) | -7.1°F (1984) | 0.97 in (1917) |
| December 20 | 55.9°F (2017) | -6.0°F (1990) | 0.70 in (1925) |
| December 21 | 61.0°F (1933) | -16.1°F (1990) | 1.01 in (1955) |
| December 22 | 60.1°F (1933) | -14.1°F (1990) | 1.26 in (1964) |
| December 23 | 60.1°F (1950) | -13.0°F (1983) | 1.09 in (1964) |
| December 24 | 55.0°F (2013) | -8.0°F (1924) | 0.88 in (1964) |
| December 25 | 55.0°F (1980) | -11.0°F (1924) | 0.63 in (1980) |
| December 26 | 57.9°F (1980) | -7.1°F (1924) | 0.58 in (1928) |
| December 27 | 60.1°F (1980) | 3.9°F (1983) | 0.88 in (1942) |
| December 28 | 60.1°F (1917) | -0.9°F (1983) | 1.03 in (1945) |
| December 29 | 60.1°F (1917) | -14.1°F (1990) | 0.51 in (1996) |
| December 30 | 59.0°F (1917) | -9.0°F (1968) | 0.83 in (2005) |
| December 31 | 57.0°F (1938) | -9.9°F (1968) | 0.60 in (2005) |