December weather in Walnut Creek, CA
The average temperature in Walnut Creek in December is 49.9°F (41.2°F–58.7°F). Average precipitation: 3.55 inches.
December is a winter month in Walnut Creek, and is cooler than the annual average of 62.4°F. Daily temperatures swing about 17.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 23m. For travel, December is a comfortable month to visit.
Avg High
58.7°F
Avg Low
41.2°F
Precipitation
3.55 in
Daylight
9h 23m
December records in Walnut Creek
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 69.1°F (1995) | 34.0°F (2004) | 1.00 in (2005) |
| December 2 | 73.9°F (2011) | 35.1°F (2004) | 1.75 in (2001) |
| December 3 | 73.9°F (2011) | 35.1°F (1991) | 1.45 in (2014) |
| December 4 | 69.1°F (2014) | 30.9°F (2004) | 0.31 in (1994) |
| December 5 | 68.0°F (1995) | 28.0°F (2013) | 0.72 in (1996) |
| December 6 | 66.9°F (1995) | 28.9°F (2013) | 0.60 in (1992) |
| December 7 | 66.9°F (2014) | 34.0°F (1998) | 1.22 in (1997) |
| December 8 | 66.0°F (2000) | 30.0°F (2009) | 0.65 in (2004) |
| December 9 | 66.9°F (2005) | 28.0°F (2009) | 1.07 in (1992) |
| December 10 | 66.0°F (1993) | 28.0°F (2009) | 0.81 in (1996) |
| December 11 | 66.9°F (2014) | 30.9°F (2013) | 1.85 in (2014) |
| December 12 | 66.9°F (2018) | 30.9°F (1997) | 2.20 in (1995) |
| December 13 | 64.0°F (1995) | 33.1°F (2017) | 1.02 in (2009) |
| December 14 | 64.0°F (1996) | 33.1°F (2013) | 0.77 in (1997) |
| December 15 | 64.0°F (2017) | 30.9°F (1997) | 1.10 in (2014) |
| December 16 | 66.0°F (1998) | 34.0°F (1999) | 1.50 in (2008) |
| December 17 | 66.0°F (2000) | 32.0°F (2016) | 0.64 in (2018) |
| December 18 | 66.9°F (1998) | 30.0°F (2006) | 3.50 in (2005) |
| December 19 | 73.9°F (1999) | 28.9°F (2006) | 1.42 in (2010) |
| December 20 | 69.1°F (1999) | 28.9°F (2006) | 0.41 in (2010) |
| December 21 | 71.1°F (1999) | 27.0°F (1998) | 1.25 in (1996) |
| December 22 | 71.1°F (1999) | 26.1°F (1998) | 0.65 in (2005) |
| December 23 | 64.9°F (2014) | 24.1°F (1998) | 0.65 in (2016) |
| December 24 | 66.9°F (2013) | 24.1°F (1998) | 0.30 in (2003) |
| December 25 | 66.9°F (2013) | 26.1°F (1998) | 0.22 in (2008) |
| December 26 | 64.0°F (2006) | 27.0°F (1998) | 0.70 in (2005) |
| December 27 | 64.9°F (1995) | 28.9°F (1997) | 1.10 in (2004) |
| December 28 | 69.1°F (1999) | 32.0°F (2003) | 1.25 in (2001) |
| December 29 | 64.9°F (2013) | 32.0°F (2003) | 1.03 in (2003) |
| December 30 | 64.9°F (1995) | 32.0°F (1994) | 0.80 in (2003) |
| December 31 | 68.0°F (1996) | 32.0°F (2006) | 3.95 in (2005) |