December weather in Fountain Valley, CA
The average temperature in Fountain Valley in December is 57.4°F (48.3°F–66.5°F). Average precipitation: 2.04 inches.
December is a winter month in Fountain Valley, and is cooler than the annual average of 64.9°F. Daily temperatures swing about 18.2°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 46m. For travel, December is a comfortable month to visit.
Avg High
66.5°F
Avg Low
48.3°F
Precipitation
2.04 in
Daylight
9h 46m
December records in Fountain Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 75.9°F (2010) | 37.0°F (2004) | 0.02 in (2012) |
| December 2 | 80.1°F (2006) | 39.0°F (2004) | 0.72 in (2014) |
| December 3 | 79.0°F (2006) | 42.1°F (2007) | 0.60 in (2014) |
| December 4 | 75.9°F (2006) | 41.0°F (2004) | 0.79 in (2019) |
| December 5 | 79.0°F (2000) | 41.0°F (1999) | 0.44 in (2010) |
| December 6 | 80.1°F (2017) | 39.9°F (2011) | 3.24 in (2018) |
| December 7 | 81.0°F (2001) | 37.9°F (2011) | 1.26 in (2009) |
| December 8 | 87.1°F (2020) | 37.0°F (2009) | 0.10 in (2007) |
| December 9 | 87.1°F (2017) | 41.0°F (2013) | 0.20 in (2006) |
| December 10 | 88.0°F (2017) | 39.0°F (2013) | 0.07 in (2015) |
| December 11 | 80.1°F (2017) | 39.9°F (2013) | 0.89 in (2022) |
| December 12 | 90.0°F (2010) | 41.0°F (2003) | 1.97 in (2014) |
| December 13 | 81.0°F (2010) | 42.1°F (1999) | 0.48 in (2012) |
| December 14 | 75.9°F (2013) | 41.0°F (2007) | 1.43 in (2021) |
| December 15 | 84.9°F (2013) | 37.9°F (2015) | 1.50 in (2008) |
| December 16 | 79.0°F (1999) | 37.9°F (2001) | 0.98 in (2002) |
| December 17 | 79.0°F (2004) | 39.9°F (2001) | 0.87 in (2008) |
| December 18 | 82.9°F (2004) | 37.9°F (2016) | 0.35 in (2010) |
| December 19 | 82.0°F (1999) | 37.9°F (2012) | 1.36 in (2010) |
| December 20 | 79.0°F (1999) | 37.9°F (2012) | 1.74 in (2010) |
| December 21 | 78.1°F (2020) | 39.9°F (2012) | 1.31 in (2010) |
| December 22 | 75.0°F (2014) | 41.0°F (2007) | 1.87 in (2010) |
| December 23 | 81.0°F (2014) | 39.0°F (2009) | 1.23 in (2019) |
| December 24 | 79.0°F (1999) | 37.9°F (2011) | 1.29 in (2025) |
| December 25 | 84.0°F (2013) | 37.9°F (2016) | 0.44 in (2010) |
| December 26 | 84.0°F (2013) | 37.0°F (2008) | 1.34 in (2019) |
| December 27 | 80.1°F (2013) | 36.0°F (2003) | 0.40 in (2022) |
| December 28 | 77.0°F (2017) | 36.0°F (2003) | 1.04 in (2020) |
| December 29 | 80.1°F (2013) | 37.9°F (2013) | 0.90 in (2010) |
| December 30 | 78.1°F (2025) | 39.0°F (2012) | 0.32 in (2023) |
| December 31 | 77.0°F (2019) | 36.0°F (2010) | 0.92 in (2022) |