Weather on March 21
Denver, CO
55 Years of Data
Avg High
60°F
Avg Low
28°F
Warmest
2026
68°F avg
Coldest
2002
19°F avg
About This Date
March 21st in Denver, CO typically brings mild spring weather, with average highs around 60°F and lows near 28°F — a 32°F daily swing. Over 56 years of records, the warmest March 21st was in 2026 (68°F average), while the coldest was 2002 (19°F) — a 49°F range across recorded history. Precipitation has occurred on 13% of recorded March 21st dates, with snow falling 9% of the time. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Denver, CO? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 91° | 45° | 68° | — | — |
| 2025 | 62° | 28° | 45° | — | — |
| 2024 | 64° | 29° | 46° | — | — |
| 2023 | 57° | 31° | 44° | — | — |
| 2022 | 66° | 33° | 50° | 0.03" | — |
| 2021 | 60° | 33° | 47° | — | — |
| 2020 | 34° | 19° | 26° | — | — |
| 2019 | 63° | 31° | 47° | — | — |
| 2018 | 55° | 27° | 41° | — | — |
| 2017 | 78° | 37° | 58° | — | — |
| 2016 | 59° | 22° | 40° | — | — |
| 2015 | 65° | 34° | 49° | — | — |
| 2014 | 71° | 25° | 48° | — | — |
| 2013 | 54° | 20° | 37° | — | — |
| 2012 | 56° | 26° | 41° | — | — |
| 2011 | 65° | 35° | 50° | — | — |
| 2010 | 35° | 16° | 25° | — | — |
| 2009 | 71° | 36° | 53° | — | — |
| 2008 | 72° | 31° | 51° | — | — |
| 2007 | 77° | 40° | 58° | — | — |
| 2006 | 42° | 13° | 27° | — | — |
| 2005 | 62° | 33° | 48° | 1.19" | — |
| 2004 | 64° | 29° | 46° | — | — |
| 2003 | 49° | 26° | 37° | — | — |
| 2002coldest | 26° | 13° | 19° | — | 0.6" |
| 2001 | 67° | 37° | 52° | — | — |
| 2000 | 40° | 25° | 32° | — | — |
| 1999 | 74° | 32° | 53° | — | — |
| 1998 | 55° | 25° | 40° | — | — |
| 1997 | 82° | 45° | 63° | — | — |
| 1996 | 54° | 31° | 42° | — | — |
| 1995 | 78° | 41° | 60° | — | — |
| 1994 | 69° | 35° | 52° | — | — |
| 1993 | 60° | 33° | 47° | — | — |
| 1992 | 42° | 25° | 33° | 0.25" | 0.7" |
| 1991 | 55° | 29° | 42° | — | — |
| 1990 | 70° | 37° | 53° | — | — |
| 1989 | 61° | 17° | 39° | — | — |
| 1988 | 71° | 41° | 56° | — | — |
| 1987 | 47° | 4° | 25° | — | — |
| 1986 | 67° | 30° | 48° | — | — |
| 1985 | 61° | 30° | 45° | — | — |
| 1984 | 64° | 26° | 45° | — | — |
| 1983 | 37° | 12° | 25° | — | — |
| 1982 | 48° | 13° | 30° | — | — |
| 1981 | 42° | 32° | 37° | 0.03" | — |
| 1980 | 63° | 20° | 41° | — | — |
| 1979 | 39° | 32° | 36° | 0.13" | 0.4" |
| 1978 | 74° | 30° | 52° | — | — |
| 1977 | 50° | 15° | 33° | — | — |
| 1976 | 50° | 28° | 39° | — | — |
| 1975 | 68° | 37° | 53° | — | — |
| 1974 | 49° | 13° | 31° | 0.05" | 0.2" |
| 1973 | 66° | 35° | 51° | 0.18" | 0.8" |
| 1972 | 70° | 28° | 49° | — | — |
| 1971 | 64° | 29° | 46° | — | — |
56 years of data from NORTHGLENN