Weather on December 18
Vallejo, CA
55 Years of Data
Avg High
56°F
Avg Low
39°F
Warmest
2023
55°F avg
Coldest
2008
36°F avg
About This Date
December 18th in Vallejo, CA typically brings cool winter weather, with average highs around 56°F and lows near 39°F. Over 55 years of records, the warmest December 18th was in 2023 (55°F average), while the coldest was 2008 (36°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 29% of December 18th dates historically, with the wettest December 18th recording 5.54" 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 18th in Vallejo, CA? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 61° | 50° | 55° | — | — |
| 2024 | 55° | 44° | 50° | — | — |
| 2023warmest | 61° | 50° | 55° | 3.33" | — |
| 2022 | 52° | 36° | 44° | — | — |
| 2021 | 51° | 37° | 44° | — | — |
| 2020 | 61° | 41° | 51° | — | — |
| 2019 | 54° | 43° | 48° | 0.99" | — |
| 2018 | 63° | 45° | 54° | — | — |
| 2017 | 62° | 41° | 52° | — | — |
| 2016 | 55° | 33° | 44° | — | — |
| 2015 | 57° | 43° | 50° | — | — |
| 2014 | 56° | 50° | 53° | — | — |
| 2013 | 59° | 33° | 46° | — | — |
| 2012 | 54° | 31° | 42° | — | — |
| 2011 | 53° | 27° | 40° | — | — |
| 2010 | 57° | 52° | 54° | 0.58" | — |
| 2009 | 57° | 39° | 48° | — | — |
| 2008coldest | 51° | 22° | 36° | 0.46" | — |
| 2007 | 57° | 41° | 49° | 1.7" | — |
| 2006 | 55° | 21° | 38° | — | — |
| 2005 | 60° | 45° | 52° | 5.54" | — |
| 2004 | 50° | 31° | 40° | — | — |
| 2003 | 61° | 45° | 53° | — | — |
| 2002 | 54° | 30° | 42° | — | — |
| 2001 | 57° | 38° | 47° | — | — |
| 2000 | 66° | 38° | 52° | — | — |
| 1999 | 57° | 40° | 48° | — | — |
| 1998 | 65° | 38° | 51° | — | — |
| 1997 | 64° | 43° | 53° | 0.1" | — |
| 1996 | 53° | 39° | 46° | — | — |
| 1995 | 49° | 38° | 43° | 0.76" | — |
| 1994 | 54° | 41° | 47° | 0.1" | — |
| 1993 | 53° | 40° | 46° | — | — |
| 1992 | 51° | 30° | 41° | 0.15" | — |
| 1991 | 61° | 38° | 49° | 0.53" | — |
| 1990 | 58° | 35° | 46° | — | — |
| 1989 | 53° | 40° | 46° | — | — |
| 1988 | 57° | 44° | 51° | — | — |
| 1987 | 57° | 35° | 46° | — | — |
| 1986 | 58° | 38° | 48° | 0.89" | — |
| 1985 | 41° | 33° | 37° | — | — |
| 1984 | 46° | 33° | 40° | — | — |
| 1983 | 54° | 45° | 49° | — | — |
| 1982 | 55° | 37° | 46° | — | — |
| 1981 | 63° | 45° | 54° | 0.08" | — |
| 1980 | 60° | 44° | 52° | — | — |
| 1979 | 50° | 33° | 42° | — | — |
| 1978 | 56° | 41° | 48° | 1.32" | — |
| 1977 | 54° | 40° | 47° | 1.07" | — |
| 1976 | 61° | 33° | 47° | — | — |
| 1975 | 58° | 39° | 48° | — | — |
| 1974 | 63° | 36° | 49° | — | — |
| 1973 | 60° | 39° | 50° | — | — |
| 1972 | 47° | 41° | 44° | 0.56" | — |
| 1971 | 54° | 37° | 45° | — | — |
55 years of data from VALLEJO