Weather on December 17
Sunnyvale, CA
55 Years of Data
Avg High
60°F
Avg Low
42°F
Warmest
2025
62°F avg
Coldest
2008
42°F avg
About This Date
December 17th in Sunnyvale, CA typically brings mild winter weather, with average highs around 60°F and lows near 42°F. Over 55 years of records, the warmest December 17th was in 2025 (62°F average), while the coldest was 2008 (42°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 33% of December 17th dates historically, with the wettest December 17th recording 2.24" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 17th in Sunnyvale, CA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 72° | 52° | 62° | — | — |
| 2024 | 61° | 46° | 53° | — | — |
| 2023 | 62° | 47° | 54° | 0.43" | — |
| 2022 | 59° | 36° | 47° | — | — |
| 2021 | 56° | 37° | 46° | — | — |
| 2020 | 57° | 45° | 51° | 0.43" | — |
| 2019 | 61° | 40° | 50° | — | — |
| 2018 | 61° | 47° | 54° | 0.69" | — |
| 2017 | 64° | 45° | 54° | — | — |
| 2016 | 52° | 35° | 43° | — | — |
| 2015 | 58° | 37° | 47° | — | — |
| 2014 | 58° | 48° | 53° | 0.41" | — |
| 2013 | 61° | 41° | 51° | — | — |
| 2012 | 58° | 48° | 53° | 0.33" | — |
| 2011 | 65° | 39° | 52° | — | — |
| 2010 | 59° | 48° | 54° | 0.84" | — |
| 2009 | 61° | 48° | 54° | 0.03" | — |
| 2008coldest | 51° | 34° | 42° | — | — |
| 2007 | 57° | 48° | 53° | 0.25" | — |
| 2006 | 53° | 35° | 44° | — | — |
| 2005 | 58° | 42° | 50° | 0.84" | — |
| 2004 | 63° | 38° | 50° | — | — |
| 2003 | 59° | 38° | 48° | — | — |
| 2002 | 54° | 44° | 49° | 1.07" | — |
| 2001 | 59° | 48° | 54° | 0.25" | — |
| 2000 | 63° | 41° | 52° | — | — |
| 1999 | 60° | 37° | 49° | — | — |
| 1998 | 70° | 44° | 57° | — | — |
| 1997 | 60° | 47° | 53° | — | — |
| 1996 | 64° | 40° | 52° | — | — |
| 1995 | 56° | 38° | 47° | — | — |
| 1994 | 59° | 39° | 49° | — | — |
| 1993 | 52° | 39° | 45° | — | — |
| 1992 | 57° | 43° | 50° | 0.53" | — |
| 1991 | 60° | 43° | 51° | — | — |
| 1990 | 62° | 39° | 51° | — | — |
| 1989 | 55° | 38° | 46° | — | — |
| 1988 | 55° | 44° | 50° | — | — |
| 1987 | 57° | 43° | 50° | — | — |
| 1986 | 67° | 42° | 54° | — | — |
| 1985 | 63° | 37° | 50° | — | — |
| 1984 | 54° | 36° | 45° | — | — |
| 1983 | 59° | 50° | 55° | 0.2" | — |
| 1982 | 60° | 46° | 53° | 0.03" | — |
| 1981 | 61° | 42° | 51° | — | — |
| 1980 | 65° | 44° | 54° | — | — |
| 1979 | 60° | 39° | 50° | — | — |
| 1978 | 57° | 45° | 51° | 0.3" | — |
| 1977 | 59° | 43° | 51° | 2.24" | — |
| 1976 | 64° | 35° | 50° | — | — |
| 1975 | 67° | 39° | 53° | — | — |
| 1974 | 62° | 46° | 54° | — | — |
| 1973 | 60° | 48° | 54° | 0.05" | — |
| 1972 | 61° | 46° | 53° | 0.18" | — |
| 1971 | 55° | 34° | 44° | — | — |
55 years of data from MOFFETT FED AIRFIELD