December weather in Mill Valley, CA
The average temperature in Mill Valley in December is °F (°F–°F). Average precipitation: 7.86 inches.
December is a winter month in Mill Valley, and is cooler than the annual average of 0°F. Expect about 15 days with precipitation. Daylight averages about 9h 23m.
Avg High
°F
Avg Low
°F
Precipitation
7.86 in
Daylight
9h 23m
December records in Mill Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 71.1°F (2013) | 37.9°F (2016) | 3.20 in (2001) |
| December 2 | 66.9°F (2013) | 37.9°F (2015) | 2.30 in (2012) |
| December 3 | 64.9°F (2013) | 41.0°F (2015) | 2.50 in (1951) |
| December 4 | 62.1°F (2016) | 30.0°F (2013) | 2.12 in (1970) |
| December 5 | 66.0°F (2015) | 26.1°F (2013) | 1.74 in (2012) |
| December 6 | 64.0°F (2014) | 35.1°F (2016) | 3.85 in (1955) |
| December 7 | 62.1°F (2012) | 35.1°F (2013) | 4.08 in (1952) |
| December 8 | 66.9°F (2014) | 28.9°F (2013) | 1.19 in (2010) |
| December 9 | 64.0°F (2012) | 25.0°F (2013) | 1.70 in (1992) |
| December 10 | 66.9°F (2012) | 33.1°F (2013) | 2.54 in (2016) |
| December 11 | 66.9°F (2012) | 32.0°F (2013) | 4.64 in (1995) |
| December 12 | 69.1°F (2015) | 39.9°F (2015) | 3.79 in (2006) |
| December 13 | 62.1°F (2013) | 33.1°F (2013) | 2.30 in (2002) |
| December 14 | 63.0°F (2013) | 34.0°F (2012) | 4.40 in (2002) |
| December 15 | 66.0°F (2013) | 41.0°F (2013) | 2.90 in (2002) |
| December 16 | 66.9°F (2013) | 34.0°F (2015) | 2.66 in (2002) |
| December 17 | 70.0°F (2013) | 32.0°F (2016) | 2.10 in (1972) |
| December 18 | 64.0°F (2013) | 30.0°F (2016) | 3.65 in (2005) |
| December 19 | 63.0°F (2014) | 30.0°F (2012) | 2.98 in (2025) |
| December 20 | 63.0°F (2014) | 37.9°F (2016) | 2.18 in (1952) |
| December 21 | 64.0°F (2016) | 32.0°F (2012) | 2.50 in (1940) |
| December 22 | 68.0°F (2014) | 37.0°F (2016) | 3.48 in (1942) |
| December 23 | 68.0°F (2014) | 37.9°F (2013) | 3.53 in (1955) |
| December 24 | 68.0°F (2013) | 39.0°F (2016) | 2.60 in (1983) |
| December 25 | 71.1°F (2013) | 30.0°F (2016) | 1.60 in (1983) |
| December 26 | 70.0°F (2013) | 35.1°F (2015) | 2.65 in (1945) |
| December 27 | 70.0°F (2013) | 34.0°F (2015) | 5.00 in (1945) |
| December 28 | 64.9°F (2013) | 35.1°F (2016) | 3.18 in (1968) |
| December 29 | 68.0°F (2013) | 36.0°F (2015) | 3.12 in (2003) |
| December 30 | 68.0°F (2013) | 32.0°F (2015) | 2.25 in (1976) |
| December 31 | 64.0°F (2013) | 32.0°F (2012) | 3.56 in (2005) |