Weather on March 21
Denver, CO
55 Years of Data
Avg High
55°F
Avg Low
28°F
Warmest
1997
65°F avg
Coldest
1974
16°F avg
About This Date
March 21st in Denver, CO typically brings cool spring weather, with average highs around 55°F and lows near 28°F — a 27°F daily swing. Over 56 years of records, the warmest March 21st was in 1997 (65°F average), while the coldest was 1974 (16°F) — a 49°F range across recorded history. Precipitation has occurred on 13% of recorded March 21st dates, with snow falling 5% of the time (heaviest snowfall: 1.2"). The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Denver, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 41° | 64° | — | — |
| 2025 | 58° | 28° | 43° | — | — |
| 2024 | 59° | 34° | 46° | — | — |
| 2023 | 53° | 33° | 43° | — | — |
| 2022 | 64° | 28° | 46° | — | — |
| 2021 | 70° | 37° | 53° | — | — |
| 2020 | 29° | 17° | 23° | — | 0.1" |
| 2019 | 55° | 30° | 43° | — | — |
| 2018 | 49° | 28° | 38° | — | — |
| 2017 | 77° | 37° | 57° | — | — |
| 2016 | 61° | 22° | 41° | — | — |
| 2015 | 64° | 36° | 50° | — | — |
| 2014 | 64° | 27° | 45° | — | — |
| 2013 | 53° | 21° | 37° | — | — |
| 2012 | 48° | 28° | 38° | — | — |
| 2011 | 68° | 36° | 52° | — | — |
| 2010 | 42° | 12° | 27° | — | — |
| 2009 | 70° | 34° | 52° | — | — |
| 2008 | 68° | 29° | 48° | — | — |
| 2007 | 75° | 39° | 57° | — | — |
| 2006 | 27° | 14° | 20° | 0.18" | 1" |
| 2005 | 54° | 34° | 44° | — | — |
| 2004 | 79° | 30° | 54° | — | — |
| 2003 | 44° | 30° | 37° | 0.86" | 1.2" |
| 2002 | 63° | 10° | 36° | — | — |
| 2001 | 59° | 15° | 37° | — | — |
| 2000 | 24° | 22° | 23° | 0.69" | — |
| 1999 | 65° | 31° | 48° | — | — |
| 1998 | 52° | 21° | 36° | — | — |
| 1997warmest | 80° | 50° | 65° | — | — |
| 1996 | 60° | 31° | 45° | — | — |
| 1995 | 65° | 37° | 51° | — | — |
| 1994 | 42° | 29° | 35° | — | — |
| 1993 | 57° | 35° | 46° | — | — |
| 1992 | 60° | 28° | 44° | — | — |
| 1991 | 56° | 31° | 43° | — | — |
| 1990 | 67° | 33° | 50° | — | — |
| 1989 | 27° | 13° | 20° | — | — |
| 1988 | 67° | 22° | 44° | — | — |
| 1987 | 44° | 27° | 35° | 0.1" | — |
| 1986 | 49° | 33° | 41° | — | — |
| 1985 | 62° | 32° | 47° | — | — |
| 1984 | 57° | 26° | 42° | — | — |
| 1983 | 34° | 9° | 21° | 0.08" | — |
| 1982 | 45° | 14° | 29° | — | — |
| 1981 | 49° | 30° | 39° | 0.2" | — |
| 1980 | 59° | 27° | 43° | — | — |
| 1979 | 35° | 31° | 33° | — | — |
| 1978 | 63° | 45° | 54° | — | — |
| 1977 | 49° | 16° | 32° | — | — |
| 1976 | 42° | 27° | 34° | — | — |
| 1975 | 70° | 26° | 48° | 0.08" | — |
| 1974coldest | 21° | 11° | 16° | — | — |
| 1973 | 49° | 30° | 39° | — | — |
| 1972 | 55° | 27° | 41° | — | — |
| 1971 | 58° | 30° | 44° | — | — |
56 years of data from LAKEWOOD