Weather on December 20
Fairfield, CA
55 Years of Data
Avg High
53°F
Avg Low
38°F
Warmest
1999
59°F avg
Coldest
1985
31°F avg
About This Date
December 20th in Fairfield, CA typically brings cool winter weather, with average highs around 53°F and lows near 38°F. Over 55 years of records, the warmest December 20th was in 1999 (59°F average), while the coldest was 1985 (31°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 35% of December 20th dates historically, with the wettest December 20th recording 4.7" of rain. The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Fairfield, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 57° | 52° | 54° | 0.53" | — |
| 2024 | 47° | 42° | 44° | 0.03" | — |
| 2023 | 58° | 53° | 55° | — | — |
| 2022 | 54° | 39° | 46° | — | — |
| 2021 | 47° | 41° | 44° | — | — |
| 2020 | 60° | 36° | 48° | — | — |
| 2019 | 56° | 44° | 50° | — | — |
| 2018 | 53° | 47° | 50° | 0.03" | — |
| 2017 | 56° | 44° | 50° | 0.08" | — |
| 2016 | 56° | 34° | 45° | — | — |
| 2015 | 50° | 37° | 44° | 1.37" | — |
| 2014 | 56° | 51° | 53° | 0.13" | — |
| 2013 | 61° | 38° | 49° | — | — |
| 2012 | 56° | 31° | 43° | — | — |
| 2011 | 62° | 30° | 46° | — | — |
| 2010 | 55° | 44° | 50° | 1.04" | — |
| 2009 | 51° | 46° | 49° | — | — |
| 2008 | 54° | 35° | 44° | — | — |
| 2007 | 54° | 43° | 48° | 1.96" | — |
| 2006 | 51° | 29° | 40° | — | — |
| 2005 | 61° | 46° | 53° | — | — |
| 2004 | 43° | 34° | 38° | 0.03" | — |
| 2003 | 53° | 43° | 48° | 1.17" | — |
| 2002 | 55° | 37° | 46° | 4.7" | — |
| 2001 | 50° | 42° | 46° | 0.46" | — |
| 2000 | 61° | 38° | 49° | — | — |
| 1999warmest | 77° | 41° | 59° | — | — |
| 1998 | 53° | 32° | 43° | — | — |
| 1997 | 64° | 34° | 49° | — | — |
| 1996 | 47° | 37° | 42° | — | — |
| 1995 | 61° | 40° | 50° | — | — |
| 1994 | 47° | 44° | 45° | — | — |
| 1993 | 39° | 30° | 35° | — | — |
| 1992 | 49° | 37° | 43° | 0.13" | — |
| 1991 | 53° | 35° | 44° | — | — |
| 1990 | 44° | 31° | 37° | — | — |
| 1989 | 42° | 32° | 37° | — | — |
| 1988 | 48° | 44° | 46° | 1.42" | — |
| 1987 | 51° | 31° | 41° | — | — |
| 1986 | 52° | 39° | 45° | 0.69" | — |
| 1985coldest | 38° | 25° | 31° | — | — |
| 1984 | 55° | 26° | 41° | — | — |
| 1983 | 54° | 35° | 44° | — | — |
| 1982 | 49° | 33° | 41° | 0.15" | — |
| 1981 | 61° | 52° | 56° | 4.34" | — |
| 1980 | 54° | 37° | 45° | — | — |
| 1979 | 53° | 27° | 40° | 0.58" | — |
| 1978 | 46° | 25° | 35° | — | — |
| 1977 | 55° | 40° | 47° | — | — |
| 1976 | 64° | 29° | 46° | — | — |
| 1975 | 61° | 29° | 45° | — | — |
| 1974 | 44° | 34° | 39° | — | — |
| 1973 | 48° | 41° | 45° | — | — |
| 1972 | 57° | 49° | 53° | 0.05" | — |
| 1971 | 49° | 29° | 39° | — | — |
55 years of data from FAIRFIELD