Weather on December 18
Mission Viejo, CA
55 Years of Data
Avg High
67°F
Avg Low
48°F
Warmest
1985
73°F avg
Coldest
1988
47°F avg
About This Date
December 18th 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 18th was in 1985 (73°F average), while the coldest was 1988 (47°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 9% of December 18th dates historically, with the wettest December 18th recording 1.8" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 18th in Mission Viejo, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 54° | 68° | — | — |
| 2024 | 83° | 61° | 72° | — | — |
| 2023 | 74° | 57° | 65° | — | — |
| 2022 | 65° | 46° | 55° | — | — |
| 2021 | 68° | 49° | 58° | — | — |
| 2020 | 71° | 47° | 59° | — | — |
| 2019 | 64° | 46° | 55° | — | — |
| 2018 | 67° | 50° | 58° | — | — |
| 2017 | 72° | 53° | 62° | — | — |
| 2016 | 65° | 43° | 54° | — | — |
| 2015 | 72° | 50° | 61° | — | — |
| 2014 | 62° | 49° | 55° | — | — |
| 2013 | 71° | 53° | 62° | — | — |
| 2012 | 56° | 44° | 50° | — | — |
| 2011 | 61° | 45° | 53° | — | — |
| 2010 | 59° | 54° | 56° | — | — |
| 2009 | 81° | 57° | 69° | — | — |
| 2008 | 58° | 37° | 47° | — | — |
| 2007 | 64° | 44° | 54° | — | — |
| 2006 | 59° | 41° | 50° | — | — |
| 2005 | 66° | 45° | 55° | — | — |
| 2004 | 83° | 56° | 69° | — | — |
| 2003 | 78° | 55° | 67° | — | — |
| 2002 | 61° | 41° | 51° | — | — |
| 2001 | 68° | 46° | 57° | — | — |
| 2000 | 76° | 64° | 70° | — | — |
| 1999 | 78° | 56° | 67° | — | — |
| 1998 | 59° | 53° | 56° | — | — |
| 1997 | 60° | 50° | 55° | 1.27" | — |
| 1996 | 70° | 46° | 58° | — | — |
| 1995 | 64° | 44° | 54° | — | — |
| 1994 | 64° | 44° | 54° | — | — |
| 1993 | 66° | 41° | 54° | — | — |
| 1992 | 59° | 47° | 53° | — | — |
| 1991 | 67° | 55° | 61° | — | — |
| 1990 | 62° | 42° | 52° | — | — |
| 1989 | 59° | 46° | 53° | — | — |
| 1988coldest | 52° | 43° | 47° | 0.79" | — |
| 1987 | 64° | 43° | 53° | — | — |
| 1986 | 69° | 46° | 58° | — | — |
| 1985warmest | 86° | 60° | 73° | — | — |
| 1984 | 56° | 45° | 50° | 1.8" | — |
| 1983 | 66° | 46° | 56° | — | — |
| 1982 | 67° | 45° | 56° | — | — |
| 1981 | 72° | 49° | 60° | — | — |
| 1980 | 61° | 49° | 55° | — | — |
| 1979 | 74° | 50° | 62° | — | — |
| 1978 | 55° | 49° | 52° | 0.46" | — |
| 1977 | 62° | 51° | 57° | 1.07" | — |
| 1976 | 70° | 45° | 57° | — | — |
| 1975 | 67° | 42° | 54° | — | — |
| 1974 | 69° | 50° | 60° | — | — |
| 1973 | 73° | 44° | 59° | — | — |
| 1972 | 72° | 49° | 60° | — | — |
| 1971 | 66° | 44° | 55° | — | — |
55 years of data from EL TORO MCAS