Weather on December 31
Costa Mesa, CA
55 Years of Data
Avg High
66°F
Avg Low
47°F
Warmest
1997
66°F avg
Coldest
1974
45°F avg
About This Date
December 31st in Costa Mesa, CA typically brings mild winter weather, with average highs around 66°F and lows near 47°F. Over 55 years of records, the warmest December 31st was in 1997 (66°F average), while the coldest was 1974 (45°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 22% of December 31st dates historically, with the wettest December 31st recording 2.34" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for December 31st in Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 58° | 66° | 0.03" | — |
| 2024 | 59° | 53° | 56° | — | — |
| 2023 | 62° | 54° | 58° | 0.28" | — |
| 2022 | 63° | 58° | 60° | 2.34" | — |
| 2021 | 62° | 49° | 55° | — | — |
| 2020 | 68° | 46° | 57° | — | — |
| 2019 | 77° | 55° | 66° | — | — |
| 2018 | 64° | 50° | 57° | — | — |
| 2017 | 66° | 51° | 59° | — | — |
| 2016 | 58° | 48° | 53° | 0.71" | — |
| 2015 | 66° | 38° | 52° | — | — |
| 2014 | 59° | 46° | 53° | — | — |
| 2013 | 69° | 44° | 57° | — | — |
| 2012 | 58° | 38° | 48° | — | — |
| 2011 | 68° | 47° | 57° | — | — |
| 2010 | 57° | 36° | 46° | — | — |
| 2009 | 69° | 46° | 58° | — | — |
| 2008 | 64° | 46° | 55° | 0.03" | — |
| 2007 | 73° | 42° | 58° | — | — |
| 2006 | 63° | 44° | 53° | — | — |
| 2005 | 63° | 51° | 57° | 0.97" | — |
| 2004 | 59° | 49° | 54° | 2.03" | — |
| 2003 | 64° | 40° | 52° | — | — |
| 2002 | 61° | 48° | 54° | — | — |
| 2001 | 60° | 53° | 57° | — | — |
| 2000 | 68° | 45° | 56° | — | — |
| 1999 | 60° | 50° | 55° | 0.03" | — |
| 1998 | 67° | 47° | 57° | — | — |
| 1997warmest | 80° | 52° | 66° | — | — |
| 1996 | 68° | 56° | 62° | 0.03" | — |
| 1995 | 67° | 51° | 59° | — | — |
| 1994 | 63° | 45° | 54° | — | — |
| 1993 | 74° | 46° | 60° | — | — |
| 1992 | 65° | 42° | 53° | — | — |
| 1991 | 70° | 43° | 56° | — | — |
| 1990 | 70° | 37° | 53° | — | — |
| 1989 | 73° | 43° | 58° | — | — |
| 1988 | 59° | 42° | 51° | 0.13" | — |
| 1987 | 65° | 40° | 52° | 0.08" | — |
| 1986 | 70° | 46° | 58° | — | — |
| 1985 | 69° | 53° | 61° | — | — |
| 1984 | 66° | 42° | 54° | — | — |
| 1983 | 75° | 49° | 62° | — | — |
| 1982 | 67° | 43° | 55° | — | — |
| 1981 | 60° | 52° | 56° | — | — |
| 1980 | 80° | 46° | 63° | — | — |
| 1979 | 71° | 48° | 60° | — | — |
| 1978 | 65° | 38° | 51° | — | — |
| 1977 | 64° | 52° | 58° | — | — |
| 1976 | 60° | 51° | 56° | 1.09" | — |
| 1975 | 62° | 48° | 55° | — | — |
| 1974coldest | 57° | 34° | 45° | — | — |
| 1973 | 65° | 43° | 54° | — | — |
| 1972 | 66° | 37° | 52° | — | — |
| 1971 | 67° | 51° | 59° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP