Weather on December 18
Vacaville, CA
55 Years of Data
Avg High
56°F
Avg Low
36°F
Warmest
1980
55°F avg
Coldest
1985
34°F avg
About This Date
December 18th in Vacaville, CA typically brings cool winter weather, with average highs around 56°F and lows near 36°F. Over 55 years of records, the warmest December 18th was in 1980 (55°F average), while the coldest was 1985 (34°F) — a 21°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 10.31" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for December 18th in Vacaville, CA? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 51° | 55° | — | — |
| 2024 | 52° | 37° | 44° | — | — |
| 2023 | 57° | 50° | 54° | 2.64" | — |
| 2022 | 50° | 26° | 38° | — | — |
| 2021 | 44° | 33° | 39° | — | — |
| 2020 | 63° | 35° | 49° | — | — |
| 2019 | 51° | 43° | 47° | 1.35" | — |
| 2018 | 64° | 36° | 50° | — | — |
| 2017 | 64° | 32° | 48° | — | — |
| 2016 | 55° | 29° | 42° | — | — |
| 2015 | 57° | 41° | 49° | 0.33" | — |
| 2014 | 55° | 49° | 52° | 0.03" | — |
| 2013 | 64° | 35° | 50° | — | — |
| 2012 | 54° | 32° | 43° | — | — |
| 2011 | 55° | 31° | 43° | — | — |
| 2010 | 59° | 50° | 55° | 0.91" | — |
| 2009 | 53° | 41° | 47° | — | — |
| 2008 | 51° | 28° | 40° | 1.17" | — |
| 2007 | 57° | 47° | 52° | 2.67" | — |
| 2006 | 60° | 31° | 45° | — | — |
| 2005 | 61° | 40° | 50° | 10.31" | — |
| 2004 | 47° | 33° | 40° | — | — |
| 2003 | 62° | 37° | 50° | — | — |
| 2002 | 57° | 34° | 45° | — | — |
| 2001 | 56° | 41° | 48° | — | — |
| 2000 | 60° | 34° | 47° | — | — |
| 1999 | 62° | 33° | 48° | — | — |
| 1998 | 62° | 32° | 47° | — | — |
| 1997 | 60° | 45° | 52° | — | — |
| 1996 | 62° | 35° | 49° | — | — |
| 1995 | 50° | 42° | 46° | 0.64" | — |
| 1994 | 52° | 39° | 45° | — | — |
| 1993 | 55° | 34° | 44° | — | — |
| 1992 | 51° | 28° | 40° | — | — |
| 1991 | 60° | 40° | 50° | 0.79" | — |
| 1990 | 50° | 32° | 41° | — | — |
| 1989 | 54° | 31° | 42° | — | — |
| 1988 | 54° | 35° | 44° | 0.03" | — |
| 1987 | 53° | 30° | 42° | — | — |
| 1986 | 60° | 35° | 48° | 0.43" | — |
| 1985coldest | 44° | 24° | 34° | — | — |
| 1984 | 43° | 33° | 38° | 0.13" | — |
| 1983 | 58° | 36° | 47° | — | — |
| 1982 | 57° | 35° | 46° | — | — |
| 1981 | 51° | 45° | 48° | 1.78" | — |
| 1980warmest | 66° | 45° | 55° | — | — |
| 1979 | 54° | 30° | 42° | — | — |
| 1978 | 47° | 37° | 42° | 0.2" | — |
| 1977 | 55° | 37° | 46° | — | — |
| 1976 | 65° | 30° | 47° | — | — |
| 1975 | 60° | 27° | 43° | — | — |
| 1974 | 56° | 29° | 42° | — | — |
| 1973 | 62° | 36° | 49° | — | — |
| 1972 | 50° | 43° | 46° | 0.08" | — |
| 1971 | 54° | 27° | 40° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS