Weather on December 21
El Monte, CA
55 Years of Data
Avg High
69°F
Avg Low
44°F
Warmest
2020
70°F avg
Coldest
1990
44°F avg
About This Date
December 21st in El Monte, CA typically brings mild winter weather, with average highs around 69°F and lows near 44°F — a 25°F daily swing. Over 55 years of records, the warmest December 21st was in 2020 (70°F average), while the coldest was 1990 (44°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 11% of December 21st dates historically, with the wettest December 21st recording 3" of rain. The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in El Monte, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 53° | 62° | — | — |
| 2024 | 68° | 52° | 60° | — | — |
| 2023 | 65° | 56° | 60° | — | — |
| 2022 | 73° | 55° | 64° | — | — |
| 2021 | 69° | 55° | 62° | — | — |
| 2020warmest | 85° | 56° | 70° | — | — |
| 2019 | 75° | 59° | 67° | — | — |
| 2018 | 69° | 55° | 62° | — | — |
| 2017 | 62° | 45° | 53° | — | — |
| 2016 | 76° | 47° | 61° | — | — |
| 2015 | 60° | 46° | 53° | — | — |
| 2014 | 68° | 49° | 58° | — | — |
| 2013 | 62° | 44° | 53° | — | — |
| 2012 | 68° | 39° | 54° | — | — |
| 2011 | 69° | 47° | 58° | — | — |
| 2010 | 56° | 48° | 52° | — | — |
| 2009 | 66° | 50° | 58° | — | — |
| 2008 | 66° | 41° | 54° | — | — |
| 2007 | 62° | 42° | 52° | — | — |
| 2006 | 62° | 38° | 50° | — | — |
| 2005 | 83° | 53° | 68° | — | — |
| 2004 | 85° | 45° | 65° | — | — |
| 2003 | 79° | 57° | 68° | — | — |
| 2002 | 59° | 43° | 51° | — | — |
| 2001 | 60° | 42° | 51° | 2.41" | — |
| 2000 | 75° | 39° | 57° | — | — |
| 1999 | 78° | 42° | 60° | — | — |
| 1998 | 65° | 33° | 49° | — | — |
| 1997 | 70° | 35° | 52° | — | — |
| 1996 | 68° | 38° | 53° | 1.83" | — |
| 1995 | 67° | 38° | 52° | — | — |
| 1994 | 79° | 40° | 59° | — | — |
| 1993 | 70° | 35° | 52° | — | — |
| 1992 | 67° | 33° | 50° | — | — |
| 1991 | 75° | 42° | 59° | — | — |
| 1990coldest | 55° | 33° | 44° | — | — |
| 1989 | 67° | 39° | 53° | — | — |
| 1988 | 61° | 47° | 54° | 3" | — |
| 1987 | 71° | 36° | 53° | — | — |
| 1986 | 75° | 40° | 57° | — | — |
| 1985 | 84° | 43° | 63° | — | — |
| 1984 | 62° | 36° | 49° | — | — |
| 1983 | 60° | 39° | 50° | — | — |
| 1982 | 71° | 39° | 55° | — | — |
| 1981 | 69° | 49° | 59° | 0.2" | — |
| 1980 | 78° | 44° | 61° | — | — |
| 1979 | 63° | 51° | 57° | 0.3" | — |
| 1978 | 69° | 34° | 51° | — | — |
| 1977 | 67° | 54° | 60° | 0.64" | — |
| 1976 | 76° | 39° | 57° | — | — |
| 1975 | 68° | 42° | 55° | — | — |
| 1974 | 71° | 41° | 56° | — | — |
| 1973 | 73° | 41° | 57° | — | — |
| 1972 | 83° | 45° | 64° | — | — |
| 1971 | 60° | 38° | 49° | — | — |
55 years of data from SAN GABRIEL FIRE DEPT