Weather on December 31
Santa Rosa, CA
55 Years of Data
Avg High
57°F
Avg Low
39°F
Warmest
1996
60°F avg
Coldest
1987
39°F avg
About This Date
December 31st in Santa Rosa, CA typically brings cool winter weather, with average highs around 57°F and lows near 39°F. Over 55 years of records, the warmest December 31st was in 1996 (60°F average), while the coldest was 1987 (39°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 25% of December 31st dates historically, with the wettest December 31st recording 10.54" of rain. The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Santa Rosa, CA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 56° | 44° | 50° | 0.36" | — |
| 2024 | 58° | 34° | 46° | — | — |
| 2023 | 60° | 47° | 53° | — | — |
| 2022 | 55° | 46° | 51° | — | — |
| 2021 | 56° | 30° | 43° | — | — |
| 2020 | 59° | 37° | 48° | 0.53" | — |
| 2019 | 62° | 35° | 49° | — | — |
| 2018 | 60° | 36° | 48° | — | — |
| 2017 | 57° | 35° | 46° | — | — |
| 2016 | 54° | 39° | 46° | — | — |
| 2015 | 53° | 32° | 43° | — | — |
| 2014 | 61° | 44° | 52° | — | — |
| 2013 | 62° | 41° | 52° | — | — |
| 2012 | 51° | 34° | 42° | — | — |
| 2011 | 63° | 31° | 47° | — | — |
| 2010 | 52° | 30° | 41° | — | — |
| 2009 | 55° | 45° | 50° | — | — |
| 2008 | 56° | 40° | 48° | — | — |
| 2007 | 58° | 27° | 42° | — | — |
| 2006 | 56° | 35° | 45° | — | — |
| 2005 | 58° | 47° | 52° | 10.54" | — |
| 2004 | 49° | 39° | 44° | 1.42" | — |
| 2003 | 55° | 41° | 48° | — | — |
| 2002 | 55° | 45° | 50° | 2.92" | — |
| 2001 | 59° | 54° | 56° | 2.44" | — |
| 2000 | 60° | 34° | 47° | — | — |
| 1999 | 55° | 37° | 46° | — | — |
| 1998 | 62° | 45° | 53° | — | — |
| 1997 | 58° | 41° | 49° | — | — |
| 1996warmest | 62° | 58° | 60° | 2.34" | — |
| 1995 | 66° | 52° | 59° | — | — |
| 1994 | 50° | 43° | 46° | 0.51" | — |
| 1993 | 57° | 41° | 49° | — | — |
| 1992 | 52° | 45° | 48° | 1.6" | — |
| 1991 | 58° | 43° | 50° | — | — |
| 1990 | 53° | 25° | 39° | — | — |
| 1989 | 63° | 37° | 50° | — | — |
| 1988 | 50° | 38° | 44° | 0.64" | — |
| 1987coldest | 50° | 28° | 39° | — | — |
| 1986 | 46° | 39° | 43° | 0.71" | — |
| 1985 | 58° | 47° | 52° | 0.03" | — |
| 1984 | 58° | 36° | 47° | — | — |
| 1983 | 63° | 47° | 55° | 0.81" | — |
| 1982 | 53° | 28° | 41° | — | — |
| 1981 | 58° | 48° | 53° | — | — |
| 1980 | 56° | 41° | 48° | — | — |
| 1979 | 61° | 53° | 57° | 1.96" | — |
| 1978 | 61° | 24° | 42° | — | — |
| 1977 | 55° | 36° | 45° | — | — |
| 1976 | 61° | 47° | 54° | — | — |
| 1975 | 55° | 30° | 43° | — | — |
| 1974 | 62° | 42° | 52° | — | — |
| 1973 | 56° | 38° | 47° | — | — |
| 1972 | 62° | 29° | 45° | — | — |
| 1971 | 58° | 31° | 44° | — | — |
55 years of data from SANTA ROSA