Weather on December 31
Sunnyvale, CA
55 Years of Data
Avg High
57°F
Avg Low
43°F
Warmest
1996
62°F avg
Coldest
1990
42°F avg
About This Date
December 31st in Sunnyvale, CA typically brings cool winter weather, with average highs around 57°F and lows near 43°F. Over 55 years of records, the warmest December 31st was in 1996 (62°F average), while the coldest was 1990 (42°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 24% of December 31st dates historically, with the wettest December 31st recording 2.9" of rain. The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
Planning for December 31st in Sunnyvale, CA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 52° | 45° | 48° | — | — |
| 2024 | 62° | 39° | 51° | — | — |
| 2023 | 61° | 49° | 55° | — | — |
| 2022 | 62° | 51° | 57° | 2.9" | — |
| 2021 | 53° | 37° | 45° | — | — |
| 2020 | 59° | 43° | 51° | 0.13" | — |
| 2019 | 64° | 38° | 51° | — | — |
| 2018 | 56° | 41° | 48° | — | — |
| 2017 | 59° | 42° | 51° | — | — |
| 2016 | 54° | 39° | 46° | — | — |
| 2015 | 53° | 38° | 45° | — | — |
| 2014 | 57° | 37° | 47° | — | — |
| 2013 | 59° | 39° | 49° | — | — |
| 2012 | 53° | 35° | 44° | — | — |
| 2011 | 63° | 43° | 53° | — | — |
| 2010 | 51° | 39° | 45° | — | — |
| 2009 | 63° | 48° | 55° | — | — |
| 2008 | 53° | 42° | 48° | 0.05" | — |
| 2007 | 57° | 42° | 50° | — | — |
| 2006 | 53° | 40° | 46° | — | — |
| 2005 | 63° | 48° | 55° | 1.85" | — |
| 2004 | 56° | 45° | 50° | 0.84" | — |
| 2003 | 55° | 42° | 49° | — | — |
| 2002 | 59° | 43° | 51° | 1.4" | — |
| 2001 | 64° | 51° | 58° | — | — |
| 2000 | 57° | 40° | 48° | — | — |
| 1999 | 53° | 42° | 48° | — | — |
| 1998 | 58° | 44° | 51° | — | — |
| 1997 | 62° | 46° | 54° | — | — |
| 1996warmest | 64° | 59° | 62° | 0.36" | — |
| 1995 | 63° | 55° | 59° | 0.03" | — |
| 1994 | 55° | 33° | 44° | 0.48" | — |
| 1993 | 58° | 46° | 52° | — | — |
| 1992 | 58° | 44° | 51° | — | — |
| 1991 | 60° | 41° | 51° | — | — |
| 1990coldest | 53° | 31° | 42° | — | — |
| 1989 | 60° | 41° | 51° | — | — |
| 1988 | 52° | 42° | 47° | 0.15" | — |
| 1987 | 50° | 36° | 43° | — | — |
| 1986 | 56° | 47° | 51° | — | — |
| 1985 | 59° | 50° | 55° | — | — |
| 1984 | 54° | 38° | 46° | — | — |
| 1983 | 60° | 50° | 55° | — | — |
| 1982 | 53° | 34° | 43° | — | — |
| 1981 | 56° | 50° | 53° | 0.36" | — |
| 1980 | 55° | 41° | 48° | — | — |
| 1979 | 67° | 56° | 61° | 0.25" | — |
| 1978 | 56° | 35° | 45° | — | — |
| 1977 | 58° | 45° | 51° | — | — |
| 1976 | 58° | 42° | 50° | — | — |
| 1975 | 55° | 40° | 47° | — | — |
| 1974 | 58° | 45° | 51° | — | — |
| 1973 | 55° | 43° | 49° | 0.3" | — |
| 1972 | 61° | 41° | 51° | — | — |
| 1971 | 55° | 39° | 47° | — | — |
55 years of data from MOFFETT FED AIRFIELD