Weather on December 17
Mission Viejo, CA
55 Years of Data
Avg High
68°F
Avg Low
49°F
Warmest
1985
71°F avg
Coldest
2008
44°F avg
About This Date
December 17th in Mission Viejo, CA typically brings mild winter weather, with average highs around 68°F and lows near 49°F. Over 55 years of records, the warmest December 17th was in 1985 (71°F average), while the coldest was 2008 (44°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 5% of December 17th dates historically, with the wettest December 17th recording 2.29" of rain. The last decade has been 2.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.4°F cooler on this date compared to 20-30 years ago.
Planning for December 17th in Mission Viejo, CA? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 48° | 60° | — | — |
| 2024 | 74° | 51° | 62° | — | — |
| 2023 | 80° | 62° | 71° | — | — |
| 2022 | 64° | 49° | 56° | — | — |
| 2021 | 70° | 48° | 59° | — | — |
| 2020 | 64° | 49° | 56° | — | — |
| 2019 | 70° | 51° | 60° | — | — |
| 2018 | 66° | 50° | 58° | — | — |
| 2017 | 70° | 58° | 64° | — | — |
| 2016 | 58° | 39° | 48° | — | — |
| 2015 | 66° | 44° | 55° | — | — |
| 2014 | 62° | 50° | 56° | — | — |
| 2013 | 80° | 59° | 70° | — | — |
| 2012 | 63° | 52° | 57° | — | — |
| 2011 | 66° | 50° | 58° | — | — |
| 2010 | 56° | 47° | 51° | — | — |
| 2009 | 76° | 57° | 66° | — | — |
| 2008coldest | 49° | 40° | 44° | — | — |
| 2007 | 62° | 43° | 52° | — | — |
| 2006 | 58° | 41° | 49° | — | — |
| 2005 | 60° | 46° | 53° | — | — |
| 2004 | 75° | 57° | 66° | — | — |
| 2003 | 75° | 55° | 65° | — | — |
| 2002 | 57° | 48° | 53° | — | — |
| 2001 | 63° | 45° | 54° | — | — |
| 2000 | 81° | 58° | 69° | — | — |
| 1999 | 82° | 60° | 71° | — | — |
| 1998 | 85° | 53° | 69° | — | — |
| 1997 | 70° | 47° | 58° | — | — |
| 1996 | 73° | 47° | 60° | — | — |
| 1995 | 69° | 46° | 58° | — | — |
| 1994 | 68° | 47° | 57° | — | — |
| 1993 | 66° | 45° | 55° | — | — |
| 1992 | 62° | 45° | 53° | 0.41" | — |
| 1991 | 71° | 56° | 63° | — | — |
| 1990 | 63° | 40° | 51° | — | — |
| 1989 | 64° | 45° | 54° | — | — |
| 1988 | 57° | 44° | 51° | — | — |
| 1987 | 55° | 48° | 52° | 0.89" | — |
| 1986 | 67° | 43° | 55° | — | — |
| 1985warmest | 80° | 62° | 71° | — | — |
| 1984 | 58° | 38° | 48° | — | — |
| 1983 | 60° | 51° | 56° | — | — |
| 1982 | 67° | 43° | 55° | — | — |
| 1981 | 69° | 46° | 58° | — | — |
| 1980 | 76° | 50° | 63° | — | — |
| 1979 | 78° | 53° | 66° | — | — |
| 1978 | 59° | 51° | 55° | 2.29" | — |
| 1977 | 65° | 53° | 59° | — | — |
| 1976 | 77° | 47° | 62° | — | — |
| 1975 | 64° | 36° | 50° | — | — |
| 1974 | 73° | 50° | 62° | — | — |
| 1973 | 67° | 45° | 56° | — | — |
| 1972 | 64° | 52° | 58° | — | — |
| 1971 | 72° | 42° | 57° | — | — |
55 years of data from EL TORO MCAS