Weather on December 21
Allen, TX
55 Years of Data
Avg High
58°F
Avg Low
33°F
Warmest
1984
65°F avg
Coldest
1983
22°F avg
About This Date
December 21st in Allen, TX typically brings cool winter weather, with average highs around 58°F and lows near 33°F — a 25°F daily swing. Over 55 years of records, the warmest December 21st was in 1984 (65°F average), while the coldest was 1983 (22°F) — a 43°F range across recorded history. Rain or other precipitation has occurred on about 16% of December 21st dates historically, with the wettest December 21st recording 8.23" of rain. The last decade has been 5.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Allen, TX? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 61° | 55° | 58° | — | — |
| 2024 | 52° | 28° | 40° | — | — |
| 2023 | 60° | 55° | 58° | 1.3" | — |
| 2022 | 51° | 29° | 40° | — | — |
| 2021 | 61° | 30° | 46° | — | — |
| 2020 | 70° | 31° | 51° | — | — |
| 2019 | 49° | 42° | 45° | — | — |
| 2018 | 58° | 36° | 47° | — | — |
| 2017 | 74° | 43° | 58° | — | — |
| 2016 | 65° | 35° | 50° | — | — |
| 2015 | 69° | 42° | 56° | — | — |
| 2014 | 51° | 46° | 49° | — | — |
| 2013 | 53° | 34° | 43° | 3.63" | — |
| 2012 | 62° | 21° | 42° | — | — |
| 2011 | 53° | 33° | 43° | — | — |
| 2010 | 82° | 48° | 65° | — | — |
| 2009 | 66° | 35° | 51° | — | — |
| 2008 | 36° | 19° | 28° | — | — |
| 2007 | 67° | 32° | 49° | — | — |
| 2006 | 58° | 35° | 46° | — | — |
| 2005 | 52° | 30° | 41° | — | — |
| 2004 | 66° | 40° | 53° | — | — |
| 2003 | 63° | 30° | 46° | — | — |
| 2002 | 60° | 35° | 48° | — | — |
| 2001 | 61° | 30° | 45° | — | — |
| 2000 | 48° | 23° | 36° | — | — |
| 1999 | 44° | 30° | 37° | — | — |
| 1998 | 54° | 24° | 39° | 0.13" | — |
| 1997 | 54° | 40° | 47° | 8.23" | — |
| 1996 | 63° | 34° | 48° | — | — |
| 1995 | 41° | 30° | 36° | 0.03" | — |
| 1994 | 61° | 40° | 50° | — | — |
| 1993 | 55° | 26° | 41° | — | — |
| 1992 | 56° | 38° | 47° | — | — |
| 1991 | 49° | 44° | 46° | — | — |
| 1990 | 62° | 15° | 39° | 0.15" | — |
| 1989 | 37° | 19° | 28° | — | — |
| 1988 | 68° | 36° | 52° | — | — |
| 1987 | 55° | 36° | 45° | — | — |
| 1986 | 52° | 38° | 45° | — | — |
| 1985 | 58° | 22° | 40° | — | — |
| 1984warmest | 67° | 63° | 65° | 0.18" | — |
| 1983coldest | 29° | 16° | 22° | 0.13" | — |
| 1982 | 70° | 37° | 53° | — | — |
| 1981 | 78° | 38° | 58° | 0.03" | — |
| 1980 | 39° | 17° | 28° | — | — |
| 1979 | 69° | 52° | 60° | — | — |
| 1978 | 57° | 29° | 43° | — | — |
| 1977 | 47° | 28° | 37° | — | — |
| 1976 | 53° | 16° | 34° | — | — |
| 1975 | 55° | 26° | 41° | — | — |
| 1974 | 67° | 30° | 48° | — | — |
| 1973 | 56° | 21° | 38° | — | — |
| 1972 | 60° | 41° | 51° | — | — |
| 1971 | 63° | 39° | 51° | — | — |
55 years of data from MCKINNEY MUNI AP