Weather on December 21
Vacaville, CA
55 Years of Data
About This Date
December 21st in Vacaville, CA typically brings cool winter weather, with average highs around 54°F and lows near 38°F. Over 55 years of records, the warmest December 21st was in 2014 (62°F average), while the coldest was 1990 (31°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 42% of December 21st dates historically, with the wettest December 21st recording 3.99" 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 21st in Vacaville, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 62° | 56° | 59° | 1.8" | — |
| 2024 | 52° | 45° | 48° | 0.36" | — |
| 2023 | 65° | 44° | 54° | 0.03" | — |
| 2022 | 46° | 33° | 40° | — | — |
| 2021 | 47° | 34° | 40° | — | — |
| 2020 | 48° | 33° | 41° | — | — |
| 2019 | 53° | 39° | 46° | — | — |
| 2018 | 58° | 45° | 51° | 0.33" | — |
| 2017 | 59° | 29° | 44° | — | — |
| 2016 | 64° | 36° | 50° | — | — |
| 2015 | 59° | 47° | 53° | 1.19" | — |
| 2014warmest | 70° | 54° | 62° | — | — |
| 2013 | 62° | 28° | 45° | — | — |
| 2012 | 49° | 40° | 44° | 1.7" | — |
| 2011 | 67° | 25° | 46° | — | — |
| 2010 | 53° | 45° | 49° | 0.51" | — |
| 2009 | 58° | 46° | 52° | 0.05" | — |
| 2008 | 49° | 44° | 46° | 0.81" | — |
| 2007 | 54° | 33° | 43° | — | — |
| 2006 | 45° | 42° | 43° | 1.6" | — |
| 2005 | 61° | 54° | 57° | 0.97" | — |
| 2004 | 68° | 35° | 52° | — | — |
| 2003 | 60° | 40° | 50° | — | — |
| 2002 | 55° | 41° | 48° | 0.08" | — |
| 2001 | 53° | 44° | 49° | — | — |
| 2000 | 58° | 32° | 45° | 0.08" | — |
| 1999 | 75° | 34° | 54° | — | — |
| 1998 | 44° | 20° | 32° | — | — |
| 1997 | 53° | 37° | 45° | — | — |
| 1996 | 51° | 41° | 46° | 3.99" | — |
| 1995 | 50° | 40° | 45° | — | — |
| 1994 | 47° | 37° | 42° | — | — |
| 1993 | 44° | 31° | 37° | — | — |
| 1992 | 51° | 37° | 44° | — | — |
| 1991 | 53° | 30° | 42° | — | — |
| 1990coldest | 38° | 25° | 31° | — | — |
| 1989 | 40° | 33° | 36° | — | — |
| 1988 | 52° | 37° | 44° | 0.53" | — |
| 1987 | 51° | 37° | 44° | — | — |
| 1986 | 54° | 34° | 44° | — | — |
| 1985 | 40° | 25° | 32° | — | — |
| 1984 | 53° | 33° | 43° | — | — |
| 1983 | 52° | 32° | 42° | — | — |
| 1982 | 55° | 49° | 52° | 3.4" | — |
| 1981 | 61° | 48° | 54° | 0.03" | — |
| 1980 | 54° | 39° | 46° | 0.76" | — |
| 1979 | 60° | 44° | 52° | 1.22" | — |
| 1978 | 54° | 27° | 40° | — | — |
| 1977 | 54° | 41° | 47° | 0.05" | — |
| 1976 | 61° | 29° | 45° | — | — |
| 1975 | 53° | 32° | 43° | — | — |
| 1974 | 55° | 39° | 47° | — | — |
| 1973 | 49° | 45° | 47° | 1.6" | — |
| 1972 | 56° | 51° | 53° | 0.05" | — |
| 1971 | 40° | 25° | 32° | 0.08" | — |