Weather on December 20
Mission Viejo, CA
55 Years of Data
Avg High
67°F
Avg Low
48°F
Warmest
1999
70°F avg
Coldest
1990
45°F avg
About This Date
December 20th in Mission Viejo, CA typically brings mild winter weather, with average highs around 67°F and lows near 48°F. Over 55 years of records, the warmest December 20th was in 1999 (70°F average), while the coldest was 1990 (45°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 9% of December 20th dates historically, with the wettest December 20th recording 1.07" of rain. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Mission Viejo, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 47° | 56° | — | — |
| 2024 | 75° | 53° | 64° | — | — |
| 2023 | 66° | 56° | 61° | — | — |
| 2022 | 68° | 50° | 59° | — | — |
| 2021 | 71° | 45° | 58° | — | — |
| 2020 | 81° | 56° | 68° | — | — |
| 2019 | 78° | 55° | 67° | — | — |
| 2018 | 77° | 56° | 66° | — | — |
| 2017 | 63° | 48° | 55° | — | — |
| 2016 | 78° | 58° | 68° | — | — |
| 2015 | 59° | 45° | 52° | — | — |
| 2014 | 62° | 49° | 55° | — | — |
| 2013 | 60° | 43° | 51° | — | — |
| 2012 | 66° | 47° | 56° | — | — |
| 2011 | 67° | 47° | 57° | — | — |
| 2010 | 60° | 51° | 56° | — | — |
| 2009 | 72° | 56° | 64° | — | — |
| 2008 | 62° | 41° | 52° | — | — |
| 2007 | 55° | 49° | 52° | — | — |
| 2006 | 61° | 40° | 50° | — | — |
| 2005 | 81° | 59° | 70° | — | — |
| 2004 | 74° | 49° | 61° | — | — |
| 2003 | 67° | 51° | 59° | — | — |
| 2002 | 57° | 46° | 52° | — | — |
| 2001 | 59° | 45° | 52° | — | — |
| 2000 | 74° | 53° | 63° | — | — |
| 1999warmest | 81° | 60° | 70° | — | — |
| 1998 | 54° | 42° | 48° | — | — |
| 1997 | 67° | 45° | 56° | — | — |
| 1996 | 69° | 46° | 58° | — | — |
| 1995 | 62° | 50° | 56° | — | — |
| 1994 | 74° | 48° | 61° | — | — |
| 1993 | 70° | 49° | 59° | — | — |
| 1992 | 63° | 42° | 52° | — | — |
| 1991 | 70° | 57° | 63° | — | — |
| 1990coldest | 53° | 37° | 45° | — | — |
| 1989 | 64° | 45° | 54° | — | — |
| 1988 | 57° | 43° | 50° | 0.2" | — |
| 1987 | 62° | 41° | 52° | — | — |
| 1986 | 62° | 46° | 54° | 0.79" | — |
| 1985 | 78° | 54° | 66° | — | — |
| 1984 | 59° | 43° | 51° | 1.07" | — |
| 1983 | 62° | 46° | 54° | — | — |
| 1982 | 69° | 38° | 53° | — | — |
| 1981 | 69° | 50° | 60° | 0.08" | — |
| 1980 | 72° | 48° | 60° | — | — |
| 1979 | 69° | 47° | 58° | — | — |
| 1978 | 63° | 37° | 50° | — | — |
| 1977 | 71° | 48° | 60° | — | — |
| 1976 | 68° | 47° | 57° | — | — |
| 1975 | 68° | 46° | 57° | 0.41" | — |
| 1974 | 68° | 48° | 58° | — | — |
| 1973 | 73° | 43° | 58° | — | — |
| 1972 | 79° | 49° | 64° | — | — |
| 1971 | 64° | 42° | 53° | — | — |
55 years of data from EL TORO MCAS