December weather in Petaluma, CA
The average temperature in Petaluma in December is 48.1°F (38.4°F–57.9°F). Average precipitation: 5.19 inches.
December is a winter month in Petaluma, and is cooler than the annual average of 58°F. Daily temperatures swing about 19.5°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 21m. For travel, December is a wet month.
Avg High
57.9°F
Avg Low
38.4°F
Precipitation
5.19 in
Daylight
9h 21m
December records in Petaluma
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.0°F (1929) | 24.1°F (1958) | 1.93 in (1952) |
| December 2 | 75.0°F (2011) | 25.0°F (1922) | 1.96 in (1966) |
| December 3 | 77.0°F (1927) | 26.1°F (1957) | 3.85 in (2014) |
| December 4 | 75.0°F (1958) | 21.0°F (2013) | 1.46 in (1945) |
| December 5 | 72.0°F (1976) | 25.0°F (1972) | 1.74 in (1996) |
| December 6 | 73.0°F (1929) | 23.0°F (2013) | 1.76 in (1955) |
| December 7 | 75.9°F (2020) | 23.0°F (2013) | 2.21 in (1952) |
| December 8 | 75.0°F (1988) | 21.9°F (2009) | 1.62 in (2004) |
| December 9 | 77.0°F (1934) | 19.0°F (1972) | 1.39 in (1894) |
| December 10 | 73.9°F (1926) | 19.9°F (1932) | 1.63 in (1937) |
| December 11 | 80.1°F (1958) | 19.0°F (1932) | 4.04 in (2014) |
| December 12 | 78.1°F (1958) | 19.9°F (1932) | 3.80 in (1995) |
| December 13 | 73.9°F (1926) | 19.0°F (1919) | 2.55 in (1915) |
| December 14 | 73.9°F (1926) | 16.0°F (1932) | 2.25 in (2024) |
| December 15 | 73.9°F (1926) | 17.1°F (1926) | 3.14 in (1929) |
| December 16 | 73.0°F (1926) | 17.1°F (1926) | 1.92 in (2002) |
| December 17 | 73.0°F (1926) | 19.0°F (1926) | 1.37 in (1914) |
| December 18 | 75.0°F (1926) | 25.0°F (1924) | 2.50 in (1940) |
| December 19 | 79.0°F (1999) | 19.9°F (1926) | 3.68 in (1981) |
| December 20 | 75.0°F (1926) | 19.0°F (1926) | 1.73 in (1981) |
| December 21 | 73.9°F (1926) | 19.0°F (1926) | 2.75 in (1924) |
| December 22 | 73.9°F (1926) | 18.0°F (1926) | 2.46 in (1955) |
| December 23 | 73.9°F (1926) | 21.9°F (1926) | 2.40 in (1942) |
| December 24 | 69.1°F (1999) | 17.1°F (1926) | 1.65 in (1979) |
| December 25 | 70.0°F (1972) | 21.0°F (1930) | 2.34 in (1983) |
| December 26 | 81.0°F (1967) | 18.0°F (1926) | 2.04 in (1940) |
| December 27 | 72.0°F (1967) | 19.0°F (1926) | 4.29 in (2004) |
| December 28 | 75.9°F (1967) | 18.0°F (1926) | 1.32 in (1922) |
| December 29 | 71.1°F (1967) | 19.9°F (1926) | 1.76 in (1933) |
| December 30 | 71.1°F (1989) | 21.9°F (1930) | 1.43 in (1913) |
| December 31 | 66.0°F (1995) | 18.0°F (1915) | 4.02 in (2005) |