December weather in Rancho Santa Margarita, CA
The average temperature in Rancho Santa Margarita in December is 57.7°F (47.6°F–67.8°F). Average precipitation: 2.34 inches.
December is a winter month in Rancho Santa Margarita, and is cooler than the annual average of 66.7°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 9h 47m. For travel, December is a comfortable month to visit.
Avg High
67.8°F
Avg Low
47.6°F
Precipitation
2.34 in
Daylight
9h 47m
December records in Rancho Santa Margarita
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 82.9°F (2013) | 41.0°F (2011) | 0.00 in (2005) |
| December 2 | 78.1°F (2006) | 43.0°F (2011) | 0.46 in (2014) |
| December 3 | 79.0°F (2015) | 43.0°F (2011) | 0.66 in (2014) |
| December 4 | 78.1°F (2006) | 37.9°F (2011) | 1.05 in (2019) |
| December 5 | 84.9°F (2023) | 37.9°F (2011) | 0.20 in (2018) |
| December 6 | 82.9°F (2023) | 37.9°F (2011) | 1.71 in (2018) |
| December 7 | 79.0°F (2020) | 34.0°F (2009) | 1.41 in (2009) |
| December 8 | 81.0°F (2020) | 33.1°F (2009) | 0.00 in (2005) |
| December 9 | 86.0°F (2025) | 37.9°F (2009) | 0.40 in (2006) |
| December 10 | 88.0°F (2017) | 37.9°F (2009) | 0.18 in (2006) |
| December 11 | 84.9°F (2017) | 39.9°F (2011) | 0.24 in (2015) |
| December 12 | 82.9°F (2017) | 41.0°F (2022) | 1.71 in (2014) |
| December 13 | 87.1°F (2010) | 41.0°F (2022) | 0.38 in (2012) |
| December 14 | 84.9°F (2013) | 37.0°F (2008) | 2.04 in (2021) |
| December 15 | 86.0°F (2013) | 37.0°F (2015) | 1.72 in (2008) |
| December 16 | 88.0°F (2013) | 30.0°F (2011) | 1.25 in (2016) |
| December 17 | 80.1°F (2013) | 36.0°F (2011) | 0.58 in (2008) |
| December 18 | 84.9°F (2024) | 35.1°F (2011) | 0.37 in (2008) |
| December 19 | 82.0°F (2024) | 30.9°F (2012) | 0.48 in (2013) |
| December 20 | 78.1°F (2005) | 37.0°F (2012) | 3.53 in (2010) |
| December 21 | 82.9°F (2005) | 39.0°F (2012) | 3.00 in (2010) |
| December 22 | 82.0°F (2020) | 36.0°F (2011) | 4.02 in (2010) |
| December 23 | 84.9°F (2014) | 35.1°F (2009) | 1.25 in (2021) |
| December 24 | 80.1°F (2013) | 37.9°F (2009) | 1.64 in (2025) |
| December 25 | 81.0°F (2013) | 37.9°F (2008) | 0.30 in (2008) |
| December 26 | 82.0°F (2013) | 35.1°F (2008) | 2.00 in (2019) |
| December 27 | 84.0°F (2013) | 36.0°F (2008) | 0.18 in (2006) |
| December 28 | 80.1°F (2017) | 30.9°F (2015) | 0.55 in (2020) |
| December 29 | 84.0°F (2017) | 37.9°F (2008) | 0.81 in (2010) |
| December 30 | 80.1°F (2017) | 30.0°F (2010) | 0.28 in (2021) |
| December 31 | 75.9°F (2011) | 32.0°F (2010) | 0.68 in (2016) |