Weather on December 31
Vacaville, CA
55 Years of Data
Avg High
55°F
Avg Low
37°F
Warmest
1996
59°F avg
Coldest
1978
33°F avg
About This Date
December 31st in Vacaville, CA typically brings cool winter weather, with average highs around 55°F and lows near 37°F. Over 55 years of records, the warmest December 31st was in 1996 (59°F average), while the coldest was 1978 (33°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 31% of December 31st dates historically, with the wettest December 31st recording 8.33" of rain. The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Vacaville, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 48° | 39° | 44° | 1.5" | — |
| 2024 | 59° | 35° | 47° | — | — |
| 2023 | 56° | 48° | 52° | — | — |
| 2022 | 59° | 46° | 53° | 3.07" | — |
| 2021 | 55° | 33° | 44° | — | — |
| 2020 | 62° | 41° | 52° | — | — |
| 2019 | 62° | 36° | 49° | — | — |
| 2018 | 56° | 42° | 49° | — | — |
| 2017 | 61° | 34° | 47° | — | — |
| 2016 | 57° | 36° | 46° | — | — |
| 2015 | 56° | 25° | 41° | — | — |
| 2014 | 59° | 42° | 51° | — | — |
| 2013 | 66° | 33° | 50° | — | — |
| 2012 | 52° | 29° | 41° | — | — |
| 2011 | 63° | 33° | 48° | — | — |
| 2010 | 48° | 28° | 38° | — | — |
| 2009 | 54° | 46° | 50° | — | — |
| 2008 | 46° | 37° | 42° | — | — |
| 2007 | 57° | 37° | 47° | — | — |
| 2006 | 55° | 35° | 45° | — | — |
| 2005 | 60° | 48° | 54° | 8.33" | — |
| 2004 | 55° | 41° | 48° | 0.91" | — |
| 2003 | 55° | 39° | 47° | — | — |
| 2002 | 72° | 38° | 55° | 1.35" | — |
| 2001 | 58° | 51° | 54° | 0.05" | — |
| 2000 | 58° | 28° | 43° | — | — |
| 1999 | 57° | 29° | 43° | — | — |
| 1998 | 61° | 38° | 49° | — | — |
| 1997 | 56° | 41° | 48° | — | — |
| 1996warmest | 62° | 55° | 59° | 1.32" | — |
| 1995 | 64° | 47° | 55° | 0.03" | — |
| 1994 | 47° | 34° | 40° | 0.03" | — |
| 1993 | 51° | 32° | 42° | — | — |
| 1992 | 54° | 38° | 46° | 0.28" | — |
| 1991 | 56° | 46° | 51° | — | — |
| 1990 | 54° | 25° | 39° | — | — |
| 1989 | 54° | 28° | 41° | — | — |
| 1988 | 44° | 37° | 41° | 0.1" | — |
| 1987 | 50° | 28° | 39° | — | — |
| 1986 | 46° | 40° | 43° | 0.2" | — |
| 1985 | 55° | 42° | 49° | 0.2" | — |
| 1984 | 44° | 24° | 34° | — | — |
| 1983 | 62° | 45° | 53° | — | — |
| 1982 | 46° | 29° | 37° | — | — |
| 1981 | 53° | 47° | 50° | 0.13" | — |
| 1980 | 48° | 39° | 44° | — | — |
| 1979 | 60° | 43° | 51° | 0.91" | — |
| 1978coldest | 49° | 18° | 33° | — | — |
| 1977 | 57° | 38° | 47° | — | — |
| 1976 | 57° | 43° | 50° | 0.89" | — |
| 1975 | 53° | 42° | 48° | — | — |
| 1974 | 55° | 41° | 48° | — | — |
| 1973 | 52° | 34° | 43° | 0.1" | — |
| 1972 | 58° | 32° | 45° | — | — |
| 1971 | 47° | 30° | 38° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS