Weather on March 20
Longmont, CO
55 Years of Data
Avg High
58°F
Avg Low
27°F
Warmest
2026
65°F avg
Coldest
2010
22°F avg
About This Date
March 20th in Longmont, CO typically brings cool spring weather, with average highs around 58°F and lows near 27°F — a 31°F daily swing. Over 56 years of records, the warmest March 20th was in 2026 (65°F average), while the coldest was 2010 (22°F) — a 43°F range across recorded history. Precipitation has occurred on 13% of recorded March 20th dates, with snow falling 11% of the time (heaviest snowfall: 5.5"). The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for March 20th in Longmont, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 87° | 42° | 65° | — | — |
| 2025 | 49° | 21° | 35° | — | — |
| 2024 | 66° | 32° | 49° | — | — |
| 2023 | 57° | 17° | 37° | — | — |
| 2022 | 64° | 27° | 45° | — | — |
| 2021 | 54° | 25° | 39° | — | — |
| 2020 | 40° | 21° | 30° | 3.68" | 4.6" |
| 2019 | 51° | 21° | 36° | — | — |
| 2018 | 48° | 25° | 36° | — | — |
| 2017 | 77° | 52° | 64° | — | — |
| 2016 | 54° | 14° | 34° | — | — |
| 2015 | 65° | 30° | 47° | — | — |
| 2014 | 66° | 35° | 51° | — | — |
| 2013 | 53° | 19° | 36° | — | — |
| 2012 | 52° | 26° | 39° | — | — |
| 2011 | 66° | 39° | 53° | — | — |
| 2010coldest | 37° | 6° | 22° | 0.13" | 2.4" |
| 2009 | 65° | 42° | 53° | — | — |
| 2008 | 65° | 31° | 48° | — | — |
| 2007 | 76° | 39° | 57° | — | — |
| 2006 | 35° | 19° | 27° | 1.17" | 5.5" |
| 2005 | 57° | 33° | 45° | — | — |
| 2004 | 78° | 38° | 58° | — | — |
| 2003 | 40° | 24° | 32° | 0.64" | 1.2" |
| 2002 | 54° | 18° | 36° | — | — |
| 2001 | 64° | 20° | 42° | — | — |
| 2000 | 66° | 25° | 45° | — | — |
| 1999 | 60° | 21° | 41° | — | — |
| 1998 | 39° | 17° | 28° | — | — |
| 1997 | 79° | 30° | 54° | — | — |
| 1996 | 48° | 17° | 33° | — | — |
| 1995 | 61° | 26° | 43° | — | — |
| 1994 | 78° | 28° | 53° | — | — |
| 1993 | 65° | 30° | 47° | — | — |
| 1992 | 46° | 24° | 35° | — | — |
| 1991 | 65° | 37° | 51° | — | — |
| 1990 | 61° | 29° | 45° | — | — |
| 1989 | 64° | 17° | 41° | 0.28" | 1" |
| 1988 | 70° | 38° | 54° | — | — |
| 1987 | 61° | 31° | 46° | — | — |
| 1986 | 54° | 22° | 38° | — | — |
| 1985 | 63° | 30° | 46° | — | — |
| 1984 | 55° | 23° | 39° | — | — |
| 1983 | 30° | 16° | 23° | 0.08" | — |
| 1982 | 53° | 28° | 41° | — | — |
| 1981 | 52° | 29° | 40° | — | — |
| 1980 | 62° | 20° | 41° | — | — |
| 1979 | 40° | 31° | 35° | — | — |
| 1978 | 60° | 36° | 48° | — | — |
| 1977 | 51° | 24° | 38° | — | — |
| 1976 | 62° | 28° | 45° | — | — |
| 1975 | 72° | 36° | 54° | — | — |
| 1974 | 53° | 14° | 34° | 0.03" | 0.5" |
| 1973 | 39° | 27° | 33° | — | — |
| 1972 | 65° | 30° | 47° | — | — |
| 1971 | 53° | 18° | 35° | — | — |
56 years of data from LONGMONT 2 ESE