Weather on December 20
Vallejo, CA
55 Years of Data
Avg High
54°F
Avg Low
39°F
Warmest
1981
60°F avg
Coldest
1985
35°F avg
About This Date
December 20th in Vallejo, CA typically brings cool winter weather, with average highs around 54°F and lows near 39°F. Over 55 years of records, the warmest December 20th was in 1981 (60°F average), while the coldest was 1985 (35°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 33% of December 20th dates historically, with the wettest December 20th recording 4.57" 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 Vallejo, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 53° | 56° | 0.76" | — |
| 2024 | 47° | 44° | 45° | — | — |
| 2023 | 59° | 53° | 56° | 1.35" | — |
| 2022 | 51° | 38° | 44° | — | — |
| 2021 | 46° | 40° | 43° | — | — |
| 2020 | 55° | 40° | 47° | — | — |
| 2019 | 53° | 45° | 49° | 0.15" | — |
| 2018 | 59° | 48° | 54° | — | — |
| 2017 | 58° | 40° | 49° | 0.08" | — |
| 2016 | 57° | 38° | 47° | — | — |
| 2015 | 54° | 38° | 46° | 0.1" | — |
| 2014 | 58° | 50° | 54° | — | — |
| 2013 | 59° | 29° | 44° | — | — |
| 2012 | 60° | 28° | 44° | — | — |
| 2011 | 58° | 26° | 42° | — | — |
| 2010 | 54° | 45° | 49° | 2.82" | — |
| 2009 | 55° | 43° | 49° | 0.1" | — |
| 2008 | 50° | 25° | 37° | — | — |
| 2007 | 56° | 30° | 43° | 1.07" | — |
| 2006 | 52° | 27° | 39° | — | — |
| 2005 | 61° | 46° | 53° | 0.71" | — |
| 2004 | 49° | 31° | 40° | — | — |
| 2003 | 54° | 48° | 51° | 0.15" | — |
| 2002 | 54° | 35° | 44° | 4.57" | — |
| 2001 | 53° | 45° | 49° | 0.97" | — |
| 2000 | 61° | 40° | 50° | — | — |
| 1999 | 68° | 49° | 58° | — | — |
| 1998 | 46° | 34° | 40° | — | — |
| 1997 | 59° | 36° | 47° | — | — |
| 1996 | 53° | 37° | 45° | — | — |
| 1995 | 58° | 40° | 49° | — | — |
| 1994 | 50° | 40° | 45° | — | — |
| 1993 | 42° | 34° | 38° | — | — |
| 1992 | 50° | 31° | 40° | — | — |
| 1991 | 55° | 33° | 44° | — | — |
| 1990 | 43° | 30° | 36° | 0.03" | — |
| 1989 | 42° | 35° | 39° | — | — |
| 1988 | 52° | 47° | 49° | 0.61" | — |
| 1987 | 49° | 32° | 40° | — | — |
| 1986 | 56° | 39° | 47° | 0.76" | — |
| 1985coldest | 37° | 33° | 35° | — | — |
| 1984 | 57° | 31° | 44° | — | — |
| 1983 | 53° | 36° | 44° | — | — |
| 1982 | 59° | 39° | 49° | 0.2" | — |
| 1981warmest | 62° | 57° | 60° | 3.78" | — |
| 1980 | 55° | 44° | 50° | — | — |
| 1979 | 52° | 44° | 48° | 0.81" | — |
| 1978 | 48° | 28° | 38° | — | — |
| 1977 | 53° | 39° | 46° | — | — |
| 1976 | 63° | 35° | 49° | — | — |
| 1975 | 58° | 31° | 44° | — | — |
| 1974 | 49° | 38° | 43° | — | — |
| 1973 | 59° | 42° | 51° | — | — |
| 1972 | 56° | 50° | 53° | — | — |
| 1971 | 57° | 32° | 45° | — | — |
55 years of data from VALLEJO