Weather on March 15
Longmont, CO
55 Years of Data
Avg High
57°F
Avg Low
27°F
Warmest
2013
61°F avg
Coldest
1997
17°F avg
About This Date
March 15th in Longmont, 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 15th was in 2013 (61°F average), while the coldest was 1997 (17°F) — a 44°F range across recorded history. Precipitation has occurred on 21% of recorded March 15th dates, with snow falling 11% of the time (heaviest snowfall: 10.1"). The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for March 15th in Longmont, 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 |
|---|---|---|---|---|---|
| 2026 | 76° | 26° | 51° | 0.03" | 0.2" |
| 2025 | 56° | 27° | 41° | — | — |
| 2024 | 34° | 31° | 32° | 1.52" | 3" |
| 2023 | 66° | 29° | 47° | — | — |
| 2022 | 60° | 28° | 44° | — | — |
| 2021 | 32° | 17° | 25° | 2.49" | 10.1" |
| 2020 | 42° | 30° | 36° | — | — |
| 2019 | 40° | 16° | 28° | — | — |
| 2018 | 69° | 28° | 49° | — | — |
| 2017 | 78° | 38° | 58° | — | — |
| 2016 | 47° | 29° | 38° | — | — |
| 2015 | 78° | 45° | 61° | — | — |
| 2014 | 55° | 38° | 46° | — | — |
| 2013warmest | 76° | 46° | 61° | — | — |
| 2012 | 71° | 47° | 59° | — | — |
| 2011 | 63° | 34° | 48° | — | — |
| 2010 | 51° | 31° | 41° | 0.28" | 0.4" |
| 2009 | 63° | 32° | 47° | — | — |
| 2008 | 49° | 20° | 34° | — | — |
| 2007 | 58° | 31° | 44° | 0.13" | — |
| 2006 | 53° | 25° | 39° | — | — |
| 2005 | 43° | 13° | 28° | — | — |
| 2004 | 67° | 27° | 47° | — | — |
| 2003 | 78° | 41° | 60° | — | — |
| 2002 | 32° | 7° | 19° | 0.05" | 0.5" |
| 2001 | 55° | 22° | 38° | — | — |
| 2000 | 63° | 20° | 41° | — | — |
| 1999 | 71° | 21° | 46° | — | — |
| 1998 | 59° | 21° | 40° | — | — |
| 1997coldest | 26° | 9° | 17° | 0.1" | — |
| 1996 | 42° | 27° | 34° | 0.18" | — |
| 1995 | 65° | 28° | 46° | — | — |
| 1994 | 73° | 22° | 47° | — | — |
| 1993 | 61° | 27° | 44° | — | — |
| 1992 | 57° | 28° | 43° | — | — |
| 1991 | 38° | 27° | 32° | — | — |
| 1990 | 39° | 10° | 25° | — | — |
| 1989 | 55° | 23° | 39° | — | — |
| 1988 | 47° | 15° | 31° | — | — |
| 1987 | 62° | 33° | 48° | — | — |
| 1986 | 50° | 32° | 41° | 0.28" | — |
| 1985 | 63° | 24° | 43° | — | — |
| 1984 | 70° | 29° | 49° | — | — |
| 1983 | 66° | 32° | 49° | 3.12" | — |
| 1982 | 67° | 28° | 47° | — | — |
| 1981 | 59° | 27° | 43° | — | — |
| 1980 | 67° | 30° | 48° | — | — |
| 1979 | 58° | 26° | 42° | — | — |
| 1978 | 49° | 23° | 36° | — | — |
| 1977 | 54° | 20° | 37° | — | — |
| 1976 | 51° | 26° | 39° | 0.03" | — |
| 1975 | 55° | 21° | 38° | — | — |
| 1974 | 59° | 28° | 44° | — | — |
| 1973 | 41° | 19° | 30° | 0.13" | 1" |
| 1972 | 61° | 27° | 44° | — | — |
| 1971 | 47° | 25° | 36° | — | — |
56 years of data from LONGMONT 2 ESE