December weather in Vacaville, CA
The average temperature in Vacaville in December is 47.5°F (37.1°F–57.8°F). Average precipitation: 5.08 inches.
December is a winter month in Vacaville, and is cooler than the annual average of 62.1°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 20m. For travel, December is a wet month.
Avg High
57.8°F
Avg Low
37.1°F
Precipitation
5.08 in
Daylight
9h 20m
December records in Vacaville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (2021) | 28.9°F (2007) | 3.53 in (2019) |
| December 2 | 73.0°F (2011) | 28.2°F (2022) | 1.75 in (2001) |
| December 3 | 68.0°F (2023) | 30.9°F (2004) | 2.30 in (2014) |
| December 4 | 70.0°F (2020) | 24.3°F (2013) | 0.61 in (2019) |
| December 5 | 69.1°F (2017) | 23.2°F (2013) | 0.50 in (1998) |
| December 6 | 69.1°F (2014) | 20.1°F (2013) | 0.60 in (2013) |
| December 7 | 73.0°F (2020) | 27.1°F (2013) | 1.26 in (2004) |
| December 8 | 73.0°F (2024) | 25.2°F (2013) | 1.65 in (2004) |
| December 9 | 70.0°F (2012) | 23.2°F (2013) | 0.34 in (2006) |
| December 10 | 70.0°F (2020) | 21.2°F (2013) | 1.23 in (2022) |
| December 11 | 68.0°F (2017) | 23.2°F (2013) | 2.95 in (2014) |
| December 12 | 69.1°F (2023) | 23.2°F (2013) | 0.67 in (2024) |
| December 13 | 66.0°F (2023) | 26.2°F (2013) | 4.50 in (2002) |
| December 14 | 66.9°F (2006) | 27.1°F (2011) | 1.51 in (2024) |
| December 15 | 69.1°F (1998) | 27.1°F (2013) | 2.76 in (2016) |
| December 16 | 68.0°F (1998) | 29.1°F (2013) | 2.49 in (2002) |
| December 17 | 66.9°F (2017) | 28.0°F (2006) | 0.69 in (2010) |
| December 18 | 64.0°F (2013) | 26.2°F (2022) | 4.06 in (2005) |
| December 19 | 75.0°F (1999) | 26.2°F (2012) | 1.09 in (2010) |
| December 20 | 75.9°F (1999) | 26.1°F (2006) | 0.73 in (2002) |
| December 21 | 75.0°F (1999) | 19.9°F (1998) | 0.71 in (2025) |
| December 22 | 70.0°F (1999) | 19.9°F (1998) | 1.20 in (2012) |
| December 23 | 64.9°F (2005) | 17.1°F (1998) | 1.85 in (2012) |
| December 24 | 72.0°F (2013) | 18.0°F (1998) | 1.15 in (2003) |
| December 25 | 66.0°F (1999) | 23.0°F (1998) | 1.14 in (2025) |
| December 26 | 66.9°F (2013) | 24.3°F (2011) | 0.64 in (2006) |
| December 27 | 68.0°F (1999) | 24.3°F (2015) | 1.38 in (2022) |
| December 28 | 73.0°F (2013) | 26.2°F (2013) | 1.86 in (2001) |
| December 29 | 66.9°F (2023) | 28.9°F (1998) | 2.57 in (2003) |
| December 30 | 66.0°F (2002) | 27.1°F (2015) | 2.24 in (2005) |
| December 31 | 72.0°F (2002) | 25.2°F (2015) | 3.28 in (2005) |