Weather on December 18
Fullerton, CA
55 Years of Data
Avg High
70°F
Avg Low
47°F
Warmest
2024
72°F avg
Coldest
2008
48°F avg
About This Date
December 18th in Fullerton, CA typically brings pleasant winter weather, with average highs around 70°F and lows near 47°F. Over 55 years of records, the warmest December 18th was in 2024 (72°F average), while the coldest was 2008 (48°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 20% of December 18th dates historically, with the wettest December 18th recording 3.48" 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 Fullerton, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 51° | 66° | — | — |
| 2024warmest | 86° | 58° | 72° | — | — |
| 2023 | 73° | 57° | 65° | — | — |
| 2022 | 67° | 47° | 57° | — | — |
| 2021 | 73° | 50° | 62° | — | — |
| 2020 | 72° | 46° | 59° | — | — |
| 2019 | 65° | 43° | 54° | — | — |
| 2018 | 72° | 52° | 62° | — | — |
| 2017 | 75° | 48° | 62° | — | — |
| 2016 | 66° | 39° | 53° | — | — |
| 2015 | 75° | 46° | 61° | — | — |
| 2014 | 65° | 49° | 57° | — | — |
| 2013 | 75° | 56° | 65° | — | — |
| 2012 | 60° | 54° | 57° | 0.28" | — |
| 2011 | 66° | 46° | 56° | — | — |
| 2010 | 61° | 35° | 48° | 1.85" | — |
| 2009 | 81° | 61° | 71° | — | — |
| 2008coldest | 58° | 39° | 48° | 0.69" | — |
| 2007 | 62° | 51° | 57° | 0.03" | — |
| 2006 | 65° | 41° | 53° | — | — |
| 2005 | 68° | 49° | 58° | — | — |
| 2004 | 86° | 49° | 67° | — | — |
| 2003 | 79° | 49° | 64° | — | — |
| 2002 | 61° | 37° | 49° | — | — |
| 2001 | 71° | 38° | 54° | — | — |
| 2000 | 79° | 54° | 66° | — | — |
| 1999 | 77° | 46° | 62° | — | — |
| 1998 | 82° | 51° | 67° | — | — |
| 1997 | 67° | 48° | 57° | 1.35" | — |
| 1996 | 73° | 58° | 65° | — | — |
| 1995 | 68° | 42° | 55° | — | — |
| 1994 | 73° | 42° | 58° | — | — |
| 1993 | 68° | 40° | 54° | — | — |
| 1992 | 64° | 43° | 53° | 0.56" | — |
| 1991 | 65° | 54° | 59° | — | — |
| 1990 | 63° | 40° | 51° | — | — |
| 1989 | 64° | 46° | 55° | — | — |
| 1988 | 62° | 45° | 53° | 1.02" | — |
| 1987 | 70° | 49° | 59° | 0.05" | — |
| 1986 | 69° | 48° | 59° | — | — |
| 1985 | 85° | 56° | 70° | — | — |
| 1984 | 57° | 43° | 50° | 1.52" | — |
| 1983 | 68° | 45° | 56° | — | — |
| 1982 | 71° | 43° | 57° | — | — |
| 1981 | 73° | 42° | 58° | — | — |
| 1980 | 68° | 54° | 61° | — | — |
| 1979 | 79° | 42° | 60° | — | — |
| 1978 | 58° | 46° | 52° | 3.48" | — |
| 1977 | 65° | 53° | 59° | 1.14" | — |
| 1976 | 75° | 44° | 60° | — | — |
| 1975 | 74° | 37° | 55° | — | — |
| 1974 | 76° | 49° | 62° | — | — |
| 1973 | 72° | 34° | 53° | — | — |
| 1972 | 76° | 44° | 60° | — | — |
| 1971 | 67° | 42° | 54° | — | — |
55 years of data from ANAHEIM