Weather on December 18
Fontana, CA
55 Years of Data
Avg High
68°F
Avg Low
43°F
Warmest
2024
68°F avg
Coldest
1984
44°F avg
About This Date
December 18th in Fontana, CA typically brings mild winter weather, with average highs around 68°F and lows near 43°F — a 25°F daily swing. Over 54 years of records, the warmest December 18th was in 2024 (68°F average), while the coldest was 1984 (44°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 19% of December 18th dates historically, with the wettest December 18th recording 3.84" 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 Fontana, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 49° | 65° | — | — |
| 2024warmest | 85° | 51° | 68° | — | — |
| 2023 | 71° | 54° | 62° | 0.13" | — |
| 2022 | 62° | 35° | 49° | — | — |
| 2021 | 67° | 38° | 52° | — | — |
| 2020 | 68° | 45° | 56° | — | — |
| 2019 | 63° | 43° | 53° | — | — |
| 2018 | 68° | 53° | 61° | — | — |
| 2017 | 70° | 38° | 54° | — | — |
| 2016 | 65° | 33° | 49° | — | — |
| 2015 | 73° | 39° | 56° | — | — |
| 2014 | 62° | 48° | 55° | — | — |
| 2013 | 72° | 54° | 63° | — | — |
| 2012 | 59° | 43° | 51° | 0.46" | — |
| 2011 | 59° | 40° | 49° | — | — |
| 2010 | 59° | 54° | 56° | 1.22" | — |
| 2009 | 78° | 45° | 61° | — | — |
| 2008 | 54° | 38° | 46° | 0.1" | — |
| 2007 | 57° | 48° | 53° | 0.53" | — |
| 2006 | 58° | 36° | 47° | — | — |
| 2005 | 61° | 47° | 54° | — | — |
| 2004 | 80° | 42° | 61° | — | — |
| 2003 | 81° | 46° | 63° | — | — |
| 2002 | 57° | 39° | 48° | — | — |
| 2001 | 69° | 39° | 54° | — | — |
| 2000 | 75° | 46° | 61° | — | — |
| 1999 | 75° | 45° | 60° | — | — |
| 1998 | 60° | 49° | 54° | — | — |
| 1997 | 63° | 40° | 51° | 0.25" | — |
| 1996 | 70° | 42° | 56° | — | — |
| 1995 | 70° | 35° | 52° | — | — |
| 1994 | 82° | 36° | 59° | — | — |
| 1992 | 60° | 43° | 51° | 0.2" | — |
| 1991 | 61° | 53° | 57° | — | — |
| 1990 | 64° | 34° | 49° | — | — |
| 1989 | 63° | 39° | 51° | — | — |
| 1988 | 55° | 41° | 48° | 0.61" | — |
| 1987 | 67° | 42° | 54° | — | — |
| 1986 | 68° | 37° | 53° | — | — |
| 1985 | 80° | 43° | 61° | — | — |
| 1984coldest | 53° | 36° | 44° | 1.27" | — |
| 1983 | 63° | 41° | 52° | — | — |
| 1982 | 76° | 39° | 57° | — | — |
| 1981 | 73° | 42° | 58° | — | — |
| 1980 | 69° | 40° | 54° | — | — |
| 1979 | 81° | 38° | 59° | — | — |
| 1978 | 49° | 47° | 48° | 3.84" | — |
| 1977 | 61° | 43° | 52° | — | — |
| 1976 | 72° | 39° | 55° | — | — |
| 1975 | 72° | 44° | 58° | — | — |
| 1974 | 69° | 52° | 60° | — | — |
| 1973 | 79° | 45° | 62° | — | — |
| 1972 | 76° | 50° | 63° | — | — |
| 1971 | 66° | 48° | 57° | — | — |
54 years of data from FONTANA KAISER