December weather in Santa Rosa, CA
The average temperature in Santa Rosa in December is 48.6°F (38.2°F–59.0°F). Average precipitation: 6.47 inches.
December is a winter month in Santa Rosa, and is cooler than the annual average of 59°F. Daily temperatures swing about 20.8°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 9h 20m. For travel, December is a wet month.
Avg High
59.0°F
Avg Low
38.2°F
Precipitation
6.47 in
Daylight
9h 20m
December records in Santa Rosa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 75.0°F (1959) | 26.1°F (1911) | 3.32 in (1951) |
| December 2 | 77.0°F (2011) | 25.0°F (1906) | 2.00 in (1966) |
| December 3 | 79.0°F (1958) | 27.0°F (1913) | 4.42 in (1980) |
| December 4 | 77.0°F (1958) | 19.9°F (1922) | 1.44 in (1970) |
| December 5 | 79.0°F (1929) | 24.1°F (1972) | 2.04 in (1909) |
| December 6 | 73.9°F (1934) | 26.1°F (1903) | 2.30 in (1955) |
| December 7 | 75.0°F (2020) | 26.1°F (1903) | 3.48 in (1952) |
| December 8 | 75.0°F (1943) | 21.0°F (1972) | 2.49 in (2004) |
| December 9 | 73.0°F (1988) | 16.0°F (1972) | 1.61 in (1992) |
| December 10 | 80.1°F (1926) | 18.0°F (1932) | 2.85 in (1929) |
| December 11 | 73.9°F (1958) | 17.1°F (1972) | 2.75 in (1995) |
| December 12 | 79.0°F (1958) | 23.0°F (1932) | 3.45 in (1995) |
| December 13 | 73.9°F (1911) | 15.1°F (1932) | 3.25 in (1915) |
| December 14 | 72.0°F (1942) | 15.1°F (1932) | 3.12 in (2002) |
| December 15 | 72.0°F (1958) | 19.0°F (1932) | 3.30 in (1929) |
| December 16 | 72.0°F (1918) | 21.0°F (1917) | 2.35 in (1903) |
| December 17 | 72.0°F (1996) | 21.9°F (1924) | 1.64 in (1972) |
| December 18 | 75.0°F (1958) | 19.9°F (1924) | 2.25 in (2005) |
| December 19 | 78.1°F (1999) | 23.0°F (1908) | 5.23 in (1981) |
| December 20 | 75.0°F (1929) | 21.0°F (1918) | 3.05 in (1969) |
| December 21 | 72.0°F (2004) | 21.0°F (1965) | 2.96 in (1924) |
| December 22 | 73.9°F (1914) | 18.0°F (1990) | 3.80 in (1955) |
| December 23 | 78.1°F (1914) | 19.0°F (1990) | 2.13 in (1964) |
| December 24 | 72.0°F (1914) | 18.0°F (1930) | 2.64 in (1979) |
| December 25 | 73.9°F (1972) | 9.0°F (1924) | 2.72 in (1940) |
| December 26 | 82.9°F (1967) | 18.0°F (1924) | 1.76 in (1955) |
| December 27 | 73.9°F (1967) | 19.9°F (1918) | 3.92 in (2004) |
| December 28 | 75.9°F (1967) | 23.0°F (1918) | 1.85 in (2005) |
| December 29 | 73.9°F (1967) | 19.9°F (1918) | 3.21 in (2003) |
| December 30 | 70.0°F (1989) | 21.9°F (1915) | 1.60 in (2005) |
| December 31 | 70.0°F (1911) | 18.0°F (1915) | 4.15 in (2005) |