Weather on December 21
Tempe, AZ
55 Years of Data
Avg High
67°F
Avg Low
40°F
Warmest
2025
64°F avg
Coldest
1990
41°F avg
About This Date
December 21st in Tempe, AZ typically brings mild winter weather, with average highs around 67°F and lows near 40°F — a 27°F daily swing. Over 55 years of records, the warmest December 21st was in 2025 (64°F average), while the coldest was 1990 (41°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 9% of December 21st dates historically, with the wettest December 21st recording 1.02" of rain. The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Tempe, AZ? Great weather for outdoor activities.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 82° | 46° | 64° | — | — |
| 2024 | 80° | 41° | 61° | — | — |
| 2023 | 80° | 47° | 63° | — | — |
| 2022 | 67° | 33° | 50° | — | — |
| 2021 | 70° | 40° | 55° | — | — |
| 2020 | 78° | 38° | 58° | — | — |
| 2019 | 75° | 41° | 58° | — | — |
| 2018 | 70° | 36° | 53° | — | — |
| 2017 | — | 42° | — | — | — |
| 2016 | 70° | 52° | 61° | — | — |
| 2015 | — | 48° | — | — | — |
| 2014 | 65° | 47° | 56° | — | — |
| 2013 | 60° | 38° | 49° | — | — |
| 2012 | 71° | 31° | 51° | — | — |
| 2011 | 65° | 36° | 50° | — | — |
| 2010 | 66° | — | — | — | — |
| 2009 | 67° | 47° | 57° | — | — |
| 2008 | 66° | 33° | 50° | — | — |
| 2007 | — | 45° | — | 0.03" | — |
| 2006 | 58° | 26° | 42° | — | — |
| 2005 | 81° | 43° | 62° | — | — |
| 2004 | 69° | 46° | 58° | — | — |
| 2003 | 74° | 51° | 62° | — | — |
| 2002 | 60° | 36° | 48° | — | — |
| 2001 | 68° | 41° | 55° | — | — |
| 2000 | 73° | 39° | 56° | — | — |
| 1999 | 68° | 37° | 53° | — | — |
| 1998 | 62° | 45° | 53° | — | — |
| 1997 | 62° | 47° | 54° | 0.43" | — |
| 1996 | 69° | 43° | 56° | — | — |
| 1995 | 64° | 36° | 50° | — | — |
| 1994 | 78° | 39° | 59° | — | — |
| 1993 | 53° | 39° | 46° | — | — |
| 1992 | 64° | 32° | 48° | — | — |
| 1991 | 62° | 50° | 56° | — | — |
| 1990coldest | 46° | 35° | 41° | 0.18" | — |
| 1989 | 66° | 39° | 53° | — | — |
| 1988 | 62° | 39° | 51° | 0.18" | — |
| 1987 | 66° | 42° | 54° | — | — |
| 1986 | 66° | 43° | 54° | — | — |
| 1985 | 78° | 42° | 60° | — | — |
| 1984 | 62° | 38° | 50° | — | — |
| 1983 | 64° | 44° | 54° | — | — |
| 1982 | 70° | 42° | 56° | — | — |
| 1981 | 74° | 42° | 58° | — | — |
| 1980 | 74° | 40° | 57° | — | — |
| 1979 | 65° | 43° | 54° | — | — |
| 1978 | 60° | 31° | 45° | — | — |
| 1977 | 60° | 34° | 47° | — | — |
| 1976 | 70° | 33° | 51° | — | — |
| 1975 | 61° | 45° | 53° | 1.02" | — |
| 1974 | 66° | 33° | 50° | — | — |
| 1973 | 67° | 31° | 49° | — | — |
| 1972 | 69° | 35° | 52° | — | — |
| 1971 | 66° | 36° | 51° | — | — |
55 years of data from TEMPE ASU