Weather on December 31
Fairfield, CA
55 Years of Data
About This Date
December 31st in Fairfield, CA typically brings cool winter weather, with average highs around 55°F and lows near 38°F. Over 55 years of records, the warmest December 31st was in 1996 (59°F average), while the coldest was 1978 (34°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 25% of December 31st dates historically, with the wettest December 31st recording 13.21" 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 Fairfield, CA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 50° | 40° | 45° | 0.41" | — |
| 2024 | 56° | 38° | 47° | — | — |
| 2023 | 60° | 47° | 53° | — | — |
| 2022 | 59° | 51° | 55° | 4.32" | — |
| 2021 | 55° | 33° | 44° | — | — |
| 2020 | 62° | 41° | 52° | 0.1" | — |
| 2019 | 61° | 40° | 50° | — | — |
| 2018 | 56° | 39° | 47° | — | — |
| 2017 | 58° | 40° | 49° | — | — |
| 2016 | 59° | 36° | 47° | — | — |
| 2015 | 54° | 31° | 42° | — | — |
| 2014 | 59° | 42° | 51° | — | — |
| 2013 | 62° | 40° | 51° | — | — |
| 2012 | 52° | 33° | 42° | — | — |
| 2011 | 63° | 37° | 50° | — | — |
| 2010 | 52° | 31° | 41° | — | — |
| 2009 | 55° | 42° | 49° | — | — |
| 2008 | 47° | 35° | 41° | — | — |
| 2007 | 53° | 33° | 43° | — | — |
| 2006 | 55° | 30° | 43° | — | — |
| 2005 | 59° | 49° | 54° | 13.21" | — |
| 2004 | 55° | 40° | 47° | 1.02" | — |
| 2003 | 52° | 40° | 46° | — | — |
| 2002 | 57° | 46° | 52° | 1.91" | — |
| 2001 | — | 52° | — | 3.07" | — |
| 2000 | 60° | 34° | 47° | — | — |
| 1999 | 60° | 36° | 48° | — | — |
| 1998 | 54° | 45° | 49° | — | — |
| 1997 | 59° | 36° | 47° | — | — |
| 1996warmest | 62° | 55° | 59° | 0.81" | — |
| 1995 | 66° | 47° | 56° | — | — |
| 1994 | 47° | 35° | 41° | — | — |
| 1993 | 51° | 35° | 43° | — | — |
| 1992 | 55° | 44° | 50° | 0.05" | — |
| 1991 | 55° | 48° | 52° | — | — |
| 1990 | 55° | 24° | 40° | — | — |
| 1989 | 54° | 28° | 41° | — | — |
| 1988 | 45° | 34° | 39° | 0.89" | — |
| 1987 | 52° | 32° | 42° | — | — |
| 1986 | 47° | 41° | 44° | 0.18" | — |
| 1985 | 55° | 42° | 49° | 0.2" | — |
| 1984 | 48° | 24° | 36° | — | — |
| 1983 | 58° | 45° | 51° | — | — |
| 1982 | 53° | 29° | 41° | — | — |
| 1981 | 57° | 49° | 53° | — | — |
| 1980 | 48° | 38° | 43° | — | — |
| 1979 | 57° | 40° | 48° | 0.1" | — |
| 1978coldest | 49° | 20° | 34° | — | — |
| 1977 | 59° | 38° | 48° | — | — |
| 1976 | 48° | 40° | 44° | 2.11" | — |
| 1975 | 59° | 37° | 48° | — | — |
| 1974 | 54° | 39° | 46° | — | — |
| 1973 | 59° | 38° | 48° | — | — |
| 1972 | 60° | 31° | 45° | — | — |
| 1971 | 49° | 29° | 39° | — | — |
Fairfield, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Fairfield, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Fairfield, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Fairfield, CA
Fairfield, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.