Weather on March 21
Allen, TX
55 Years of Data
Avg High
70°F
Avg Low
45°F
Warmest
2026
74°F avg
Coldest
2010
37°F avg
About This Date
March 21st in Allen, TX typically brings pleasant spring weather, with average highs around 70°F and lows near 45°F — a 25°F daily swing. Over 56 years of records, the warmest March 21st was in 2026 (74°F average), while the coldest was 2010 (37°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 27% of March 21st dates historically, with the wettest March 21st recording 4.88" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Allen, TX? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 90° | 59° | 74° | — | — |
| 2025 | 75° | 37° | 56° | — | — |
| 2024 | 65° | 55° | 60° | 1.6" | — |
| 2023 | 65° | 49° | 57° | 0.13" | — |
| 2022 | 70° | 53° | 61° | 4.88" | — |
| 2021 | 67° | 39° | 53° | — | — |
| 2020 | 57° | 38° | 47° | 0.25" | — |
| 2019 | 75° | 41° | 58° | — | — |
| 2018 | 70° | 38° | 54° | — | — |
| 2017 | 84° | 59° | 72° | — | — |
| 2016 | 64° | 32° | 48° | — | — |
| 2015 | 63° | 53° | 58° | 0.61" | — |
| 2014 | 80° | 44° | 62° | — | — |
| 2013 | 68° | 49° | 58° | 0.03" | — |
| 2012 | 65° | 50° | 57° | 0.03" | — |
| 2011 | 81° | 60° | 70° | — | — |
| 2010coldest | 44° | 30° | 37° | 0.08" | — |
| 2009 | 76° | 50° | 63° | — | — |
| 2008 | 74° | 49° | 61° | — | — |
| 2007 | 76° | 62° | 69° | — | — |
| 2006 | 55° | 38° | 46° | — | — |
| 2005 | 77° | 57° | 67° | 0.51" | — |
| 2004 | 70° | 49° | 59° | — | — |
| 2003 | 56° | 45° | 50° | — | — |
| 2002 | 62° | 34° | 48° | — | — |
| 2001 | 71° | 36° | 53° | — | — |
| 2000 | 65° | 55° | 60° | 0.3" | — |
| 1999 | 73° | 36° | 54° | — | — |
| 1998 | 60° | 33° | 47° | — | — |
| 1997 | 88° | 48° | 68° | — | — |
| 1996 | 67° | — | — | — | — |
| 1995 | 78° | 49° | 63° | — | — |
| 1994 | 80° | 52° | 66° | — | — |
| 1993 | 64° | 47° | 55° | — | — |
| 1992 | 63° | 40° | 51° | — | — |
| 1991 | 80° | 36° | 58° | — | — |
| 1990 | 73° | 41° | 57° | — | — |
| 1989 | 64° | 33° | 49° | 0.64" | — |
| 1988 | 81° | 28° | 54° | — | — |
| 1987 | 78° | 52° | 65° | — | — |
| 1986 | 57° | 29° | 43° | — | — |
| 1985 | 66° | 49° | 57° | 0.25" | — |
| 1984 | 72° | 39° | 55° | — | — |
| 1983 | 52° | 32° | 42° | — | — |
| 1982 | 76° | 46° | 61° | — | — |
| 1981 | 76° | 55° | 65° | — | — |
| 1980 | 69° | 34° | 51° | — | — |
| 1979 | 75° | 59° | 67° | — | — |
| 1978 | 79° | 57° | 68° | 0.41" | — |
| 1977 | 67° | 48° | 57° | — | — |
| 1976 | 71° | 41° | 56° | — | — |
| 1975 | 80° | 60° | 70° | — | — |
| 1974 | 50° | 30° | 40° | 0.79" | — |
| 1973 | 59° | 40° | 49° | — | — |
| 1972 | 78° | 52° | 65° | 0.38" | — |
| 1971 | 78° | 45° | 61° | — | — |
56 years of data from MCKINNEY MUNI AP