Weather on December 31
Fullerton, CA
55 Years of Data
Avg High
67°F
Avg Low
45°F
Warmest
1997
67°F avg
Coldest
2010
47°F avg
About This Date
December 31st in Fullerton, CA typically brings mild winter weather, with average highs around 67°F and lows near 45°F. Over 55 years of records, the warmest December 31st was in 1997 (67°F average), while the coldest was 2010 (47°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 20% of December 31st dates historically, with the wettest December 31st recording 3.45" 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 31st in Fullerton, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 57° | 64° | 0.71" | — |
| 2024 | 59° | 48° | 54° | — | — |
| 2023 | 60° | 51° | 56° | — | — |
| 2022 | 61° | 56° | 58° | 0.53" | — |
| 2021 | 64° | 47° | 55° | — | — |
| 2020 | 69° | 45° | 57° | — | — |
| 2019 | 75° | 57° | 66° | — | — |
| 2018 | 65° | 48° | 56° | — | — |
| 2017 | 71° | 48° | 60° | — | — |
| 2016 | 61° | 54° | 57° | 3.45" | — |
| 2015 | 66° | 41° | 54° | — | — |
| 2014 | 57° | 45° | 51° | — | — |
| 2013 | 74° | 45° | 59° | — | — |
| 2012 | 61° | 36° | 48° | — | — |
| 2011 | 77° | 44° | 61° | — | — |
| 2010coldest | 61° | 34° | 47° | — | — |
| 2009 | 74° | 45° | 59° | — | — |
| 2008 | 71° | 44° | 58° | — | — |
| 2007 | 74° | 41° | 57° | — | — |
| 2006 | 65° | 41° | 53° | — | — |
| 2005 | 63° | 49° | 56° | 1.7" | — |
| 2004 | 60° | 48° | 54° | 1.98" | — |
| 2003 | 67° | 43° | 55° | — | — |
| 2002 | 60° | 44° | 52° | — | — |
| 2001 | 60° | 54° | 57° | 0.3" | — |
| 2000 | 74° | 37° | 55° | — | — |
| 1999 | 68° | 47° | 57° | 0.18" | — |
| 1998 | 76° | 46° | 61° | — | — |
| 1997warmest | 78° | 56° | 67° | — | — |
| 1996 | 70° | 54° | 62° | — | — |
| 1995 | 70° | 49° | 59° | — | — |
| 1994 | 64° | 45° | 54° | — | — |
| 1993 | 72° | 46° | 59° | — | — |
| 1992 | 66° | 44° | 55° | — | — |
| 1991 | 70° | 45° | 57° | — | — |
| 1990 | 70° | 42° | 56° | — | — |
| 1989 | 74° | 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 | 59° | 45° | 52° | 0.13" | — |
| 1980 | 83° | 47° | 65° | — | — |
| 1979 | 72° | 42° | 57° | — | — |
| 1978 | 65° | 38° | 51° | — | — |
| 1977 | 64° | 52° | 58° | — | — |
| 1976 | 61° | 48° | 54° | 0.28" | — |
| 1975 | 62° | 38° | 50° | — | — |
| 1974 | 63° | 34° | 48° | — | — |
| 1973 | 69° | 39° | 54° | — | — |
| 1972 | 66° | 34° | 50° | — | — |
| 1971 | 65° | 48° | 56° | — | — |
55 years of data from ANAHEIM