Weather on March 21
Arvada, CO
55 Years of Data
Avg High
57°F
Avg Low
27°F
Warmest
2026
68°F avg
Coldest
1989
21°F avg
About This Date
March 21st in Arvada, CO typically brings cool spring weather, with average highs around 57°F and lows near 27°F — a 30°F daily swing. Over 56 years of records, the warmest March 21st was in 2026 (68°F average), while the coldest was 1989 (21°F) — a 47°F range across recorded history. Precipitation has occurred on 9% of recorded March 21st dates, with snow falling 9% of the time (heaviest snowfall: 3"). 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 Arvada, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 85° | 51° | 68° | — | — |
| 2025 | 58° | 24° | 41° | — | — |
| 2024 | 60° | 35° | 48° | — | — |
| 2023 | 54° | 24° | 39° | — | — |
| 2022 | 65° | 31° | 48° | — | — |
| 2021 | 71° | 31° | 51° | — | — |
| 2020 | 30° | 15° | 23° | — | — |
| 2019 | 57° | 30° | 44° | — | — |
| 2018 | 53° | 25° | 39° | — | — |
| 2017 | 77° | 33° | 55° | — | — |
| 2016 | 58° | 18° | 38° | — | — |
| 2015 | 65° | 39° | 52° | — | — |
| 2014 | 66° | 21° | 44° | — | — |
| 2013 | 55° | 18° | 36° | — | — |
| 2012 | 50° | 23° | 37° | — | — |
| 2011 | 58° | 39° | 48° | — | — |
| 2010 | 55° | 18° | 36° | — | — |
| 2009 | 60° | 33° | 47° | — | — |
| 2008 | 43° | 27° | 35° | — | — |
| 2007 | 60° | 35° | 48° | — | — |
| 2006 | 40° | 7° | 23° | — | — |
| 2005 | 44° | 24° | 34° | — | — |
| 2004 | 66° | 31° | 48° | — | — |
| 2003 | 52° | 25° | 38° | — | — |
| 2002 | 65° | 17° | 41° | — | — |
| 2001 | 67° | 34° | 50° | — | — |
| 2000 | 30° | 25° | 27° | 0.51" | 0.3" |
| 1999 | 66° | 43° | 54° | — | — |
| 1998 | 51° | 22° | 36° | — | — |
| 1997 | 83° | 36° | 59° | — | — |
| 1996 | 63° | 22° | 42° | — | — |
| 1995 | 65° | 28° | 46° | — | — |
| 1994 | 42° | 27° | 34° | — | — |
| 1993 | 62° | 21° | 42° | — | — |
| 1992 | 64° | 24° | 44° | — | — |
| 1991 | 60° | 30° | 45° | — | — |
| 1990 | 69° | 37° | 53° | — | — |
| 1989coldest | 32° | 10° | 21° | — | 1" |
| 1988 | 70° | 38° | 54° | — | — |
| 1987 | 49° | 19° | 34° | 0.48" | 2" |
| 1986 | 51° | 26° | 39° | — | — |
| 1985 | 58° | 33° | 45° | — | — |
| 1984 | 60° | 32° | 46° | — | — |
| 1983 | 32° | 12° | 22° | 0.15" | 3" |
| 1982 | 43° | 10° | 26° | — | — |
| 1981 | 47° | 29° | 38° | 0.08" | — |
| 1980 | 54° | 21° | 37° | — | — |
| 1979 | 40° | 30° | 35° | 1.14" | 2" |
| 1978 | 74° | 40° | 57° | — | — |
| 1977 | 51° | 26° | 39° | — | — |
| 1976 | 50° | 21° | 36° | — | — |
| 1975 | 56° | 36° | 46° | — | — |
| 1974 | 50° | 5° | 28° | — | — |
| 1973 | 61° | 35° | 48° | — | — |
| 1972 | 70° | 32° | 51° | — | — |
| 1971 | 63° | 33° | 48° | — | — |
56 years of data from WATERTON NORTH COLORADO