Weather on December 21
El Cajon, CA
55 Years of Data
Avg High
68°F
Avg Low
42°F
Warmest
2005
68°F avg
Coldest
1992
45°F avg
About This Date
December 21st in El Cajon, CA typically brings mild winter weather, with average highs around 68°F and lows near 42°F. Over 54 years of records, the warmest December 21st was in 2005 (68°F average), while the coldest was 1992 (45°F). Rain or other precipitation has occurred on about 17% of December 21st dates historically.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in El Cajon, CA? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 50° | 64° | — | — |
| 2024 | 71° | 39° | 55° | — | — |
| 2023 | 72° | 50° | 61° | 0.03" | — |
| 2022 | 75° | 36° | 55° | — | — |
| 2021 | 69° | 50° | 60° | — | — |
| 2020 | 84° | 39° | 62° | — | — |
| 2019 | 75° | 40° | 57° | — | — |
| 2018 | 68° | 47° | 57° | — | — |
| 2017 | 64° | 48° | 56° | 0.13" | — |
| 2016 | 76° | 57° | 66° | 0.1" | — |
| 2015 | 64° | 39° | 52° | — | — |
| 2014 | 71° | 47° | 59° | — | — |
| 2013 | 61° | 41° | 51° | — | — |
| 2012 | 63° | 33° | 48° | — | — |
| 2011 | 68° | 38° | 53° | — | — |
| 2010 | 60° | 52° | 56° | 4.57" | — |
| 2009 | 68° | 48° | 58° | — | — |
| 2008 | 70° | 36° | 53° | — | — |
| 2007 | 65° | 41° | 53° | — | — |
| 2006 | 65° | 43° | 54° | — | — |
| 2005warmest | 85° | 51° | 68° | — | — |
| 2004 | 66° | 53° | 60° | — | — |
| 2003 | 79° | 40° | 59° | — | — |
| 2002 | 56° | 45° | 50° | 0.43" | — |
| 2001 | 63° | 38° | 50° | — | — |
| 2000 | 73° | 37° | 55° | — | — |
| 1999 | 76° | 49° | 62° | — | — |
| 1997 | 51° | 46° | 49° | 1.63" | — |
| 1996 | 73° | 33° | 53° | — | — |
| 1995 | 65° | 38° | 51° | — | — |
| 1994 | 72° | 56° | 64° | — | — |
| 1993 | 66° | 43° | 54° | — | — |
| 1992coldest | 61° | 30° | 45° | — | — |
| 1991 | 69° | 42° | 56° | — | — |
| 1990 | 49° | 43° | 46° | 0.23" | — |
| 1989 | 67° | 35° | 51° | — | — |
| 1988 | 60° | 52° | 56° | 0.51" | — |
| 1987 | 68° | 36° | 52° | — | — |
| 1986 | 67° | 39° | 53° | — | — |
| 1985 | 76° | 38° | 57° | — | — |
| 1984 | 64° | 40° | 52° | — | — |
| 1983 | 62° | 45° | 53° | — | — |
| 1982 | 63° | 48° | 55° | — | — |
| 1981 | 63° | 53° | 58° | — | — |
| 1980 | 80° | 41° | 61° | — | — |
| 1979 | 63° | 51° | 57° | 0.1" | — |
| 1978 | 62° | 33° | 48° | — | — |
| 1977 | 71° | 45° | 58° | — | — |
| 1976 | 71° | 36° | 53° | — | — |
| 1975 | 66° | 38° | 52° | — | — |
| 1974 | 73° | 36° | 54° | — | — |
| 1973 | 67° | 33° | 50° | — | — |
| 1972 | 78° | 41° | 60° | — | — |
| 1971 | 63° | 36° | 49° | — | — |
54 years of data from GILLESPIE FLD