Weather on March 31
Longmont, CO
55 Years of Data
Avg High
58°F
Avg Low
29°F
Warmest
1978
66°F avg
Coldest
1973
30°F avg
About This Date
March 31st in Longmont, CO typically brings cool spring weather, with average highs around 58°F and lows near 29°F — a 29°F daily swing. Over 56 years of records, the warmest March 31st was in 1978 (66°F average), while the coldest was 1973 (30°F) — a 36°F range across recorded history. Precipitation has occurred on 23% of recorded March 31st dates, with snow falling 9% of the time (heaviest snowfall: 9"). The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for March 31st in Longmont, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 83° | 41° | 62° | — | — |
| 2025 | 45° | 36° | 40° | 0.05" | — |
| 2024 | 60° | 33° | 47° | — | — |
| 2023 | 64° | 28° | 46° | — | — |
| 2022 | 51° | 25° | 38° | — | — |
| 2021 | 44° | 26° | 35° | — | — |
| 2020 | 61° | 33° | 47° | — | — |
| 2019 | 41° | 27° | 34° | — | — |
| 2018 | 66° | 28° | 47° | — | — |
| 2017 | 60° | 35° | 48° | 0.91" | — |
| 2016 | 43° | 25° | 34° | 0.03" | — |
| 2015 | 78° | 39° | 59° | — | — |
| 2014 | 64° | 37° | 51° | 0.15" | — |
| 2013 | 70° | 31° | 50° | — | — |
| 2012 | 81° | 47° | 64° | — | — |
| 2011 | 67° | 42° | 54° | — | — |
| 2010 | 71° | 40° | 55° | — | — |
| 2009 | 46° | 23° | 35° | — | — |
| 2008 | 43° | 25° | 34° | 0.3" | 1.5" |
| 2007 | 56° | 26° | 41° | — | — |
| 2006 | 66° | 33° | 50° | — | — |
| 2005 | 44° | 32° | 38° | 0.03" | — |
| 2004 | 73° | 29° | 51° | — | — |
| 2003 | 64° | 28° | 46° | — | — |
| 2002 | 58° | 18° | 38° | — | — |
| 2001 | 61° | 24° | 42° | 0.33" | 2" |
| 2000 | 40° | 29° | 34° | 0.61" | 0.8" |
| 1999 | 81° | 21° | 51° | — | — |
| 1998 | 43° | 17° | 30° | 0.56" | — |
| 1997 | 72° | 20° | 46° | — | — |
| 1996 | 56° | 25° | 40° | — | — |
| 1995 | 45° | 19° | 32° | — | — |
| 1994 | 64° | 22° | 43° | — | — |
| 1993 | 44° | 28° | 36° | 0.51" | — |
| 1992 | 64° | 32° | 48° | — | — |
| 1991 | 56° | 25° | 40° | — | — |
| 1990 | 41° | 23° | 32° | — | — |
| 1989 | 56° | 17° | 36° | — | — |
| 1988 | 37° | 23° | 30° | 1.83" | 9" |
| 1987 | 53° | 21° | 37° | — | — |
| 1986 | 71° | 41° | 56° | — | — |
| 1985 | 52° | 24° | 38° | — | — |
| 1984 | 37° | 23° | 30° | 1.02" | 2" |
| 1983 | 67° | 22° | 44° | — | — |
| 1982 | 53° | 32° | 43° | — | — |
| 1981 | 64° | 32° | 48° | — | — |
| 1980 | 51° | 26° | 39° | 0.13" | — |
| 1979 | 55° | 32° | 44° | — | — |
| 1978warmest | 80° | 51° | 66° | — | — |
| 1977 | 50° | 17° | 34° | — | — |
| 1976 | 49° | 23° | 36° | — | — |
| 1975 | 60° | 18° | 39° | — | — |
| 1974 | 74° | 42° | 58° | — | — |
| 1973coldest | 40° | 21° | 30° | — | — |
| 1972 | 44° | 20° | 32° | — | — |
| 1971 | 80° | 42° | 61° | — | — |
56 years of data from LONGMONT 2 ESE