Weather on December 21
Modesto, CA
55 Years of Data
Avg High
53°F
Avg Low
39°F
Warmest
2025
62°F avg
Coldest
1990
29°F avg
About This Date
December 21st in Modesto, CA typically brings cool winter weather, with average highs around 53°F and lows near 39°F. Over 55 years of records, the warmest December 21st was in 2025 (62°F average), while the coldest was 1990 (29°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 35% of December 21st dates historically, with the wettest December 21st recording 4.6" 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 21st in Modesto, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 66° | 57° | 62° | — | — |
| 2024 | 54° | 47° | 50° | 0.05" | — |
| 2023 | 60° | 47° | 53° | — | — |
| 2022 | 44° | 36° | 40° | — | — |
| 2021 | 44° | 40° | 42° | — | — |
| 2020 | 44° | 37° | 41° | — | — |
| 2019 | 58° | 42° | 50° | — | — |
| 2018 | 61° | 48° | 54° | — | — |
| 2017 | 53° | 32° | 43° | — | — |
| 2016 | 59° | 37° | 48° | — | — |
| 2015 | 53° | 49° | 51° | 0.66" | — |
| 2014 | 65° | 53° | 59° | — | — |
| 2013 | 59° | 32° | 46° | — | — |
| 2012 | 58° | 34° | 46° | 0.03" | — |
| 2011 | 53° | 31° | 42° | — | — |
| 2010 | 56° | 42° | 49° | 0.05" | — |
| 2009 | 55° | 45° | 50° | 0.28" | — |
| 2008 | 48° | 35° | 42° | 0.97" | — |
| 2007 | 52° | 35° | 43° | — | — |
| 2006 | 46° | 32° | 39° | 0.64" | — |
| 2005 | 60° | 48° | 54° | 0.69" | — |
| 2004 | 52° | 37° | 44° | — | — |
| 2003 | 57° | 47° | 52° | 0.05" | — |
| 2002 | 57° | 46° | 52° | 0.3" | — |
| 2001 | 53° | 45° | 49° | 0.2" | — |
| 2000 | 61° | 34° | 47° | — | — |
| 1999 | 63° | 31° | 47° | — | — |
| 1998 | 44° | 25° | 34° | — | — |
| 1997 | 55° | 39° | 47° | — | — |
| 1996 | 47° | 41° | 44° | 4.6" | — |
| 1995 | 51° | 35° | 43° | — | — |
| 1994 | 46° | 41° | 44° | — | — |
| 1993 | 40° | 36° | 38° | — | — |
| 1992 | 52° | 34° | 43° | — | — |
| 1991 | 56° | 37° | 46° | — | — |
| 1990coldest | 34° | 24° | 29° | — | — |
| 1989 | 40° | 37° | 38° | — | — |
| 1988 | 52° | 36° | 44° | — | — |
| 1987 | 53° | 38° | 45° | — | — |
| 1986 | 51° | 33° | 42° | — | — |
| 1985 | 37° | 32° | 35° | — | — |
| 1984 | 54° | 34° | 44° | — | — |
| 1983 | 51° | 32° | 42° | — | — |
| 1982 | 56° | 50° | 53° | 1.55" | — |
| 1981 | 60° | 47° | 53° | 0.1" | — |
| 1980 | 52° | 40° | 46° | 0.56" | — |
| 1979 | 55° | 45° | 50° | 1.4" | — |
| 1978 | 49° | 31° | 40° | — | — |
| 1977 | 62° | 54° | 58° | 0.15" | — |
| 1976 | 60° | 30° | 45° | — | — |
| 1975 | 60° | 32° | 46° | — | — |
| 1974 | 51° | 40° | 45° | — | — |
| 1973 | 52° | 45° | 48° | 1.6" | — |
| 1972 | 58° | 51° | 54° | — | — |
| 1971 | 50° | 30° | 40° | 1.07" | — |
55 years of data from MODESTO AP