Weather on March 17
Longmont, CO
55 Years of Data
Avg High
56°F
Avg Low
28°F
Warmest
2007
59°F avg
Coldest
1988
20°F avg
About This Date
March 17th in Longmont, CO typically brings cool spring weather, with average highs around 56°F and lows near 28°F — a 28°F daily swing. Over 56 years of records, the warmest March 17th was in 2007 (59°F average), while the coldest was 1988 (20°F) — a 39°F range across recorded history. Precipitation has occurred on 16% of recorded March 17th dates, with snow falling 11% of the time (heaviest snowfall: 5.5"). The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
Planning for March 17th in Longmont, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 55° | 19° | 37° | — | — |
| 2025 | 61° | 34° | 47° | — | — |
| 2024 | 50° | 26° | 38° | — | — |
| 2023 | 41° | 19° | 30° | — | — |
| 2022 | 53° | 32° | 43° | 1.4" | 0.7" |
| 2021 | 38° | 18° | 28° | — | — |
| 2020 | 53° | 30° | 42° | 0.1" | — |
| 2019 | 51° | 23° | 37° | — | — |
| 2018 | 57° | 27° | 42° | — | — |
| 2017 | 70° | 41° | 55° | — | — |
| 2016 | 40° | 28° | 34° | 0.81" | 3.4" |
| 2015 | 69° | 39° | 54° | — | — |
| 2014 | 68° | 44° | 56° | — | — |
| 2013 | 58° | 32° | 45° | — | — |
| 2012 | 74° | 43° | 58° | — | — |
| 2011 | 72° | 43° | 57° | — | — |
| 2010 | 69° | 34° | 51° | — | — |
| 2009 | 73° | 43° | 58° | — | — |
| 2008 | 36° | 27° | 31° | 1.24" | 5.5" |
| 2007warmest | 74° | 45° | 59° | — | — |
| 2006 | 47° | 21° | 34° | — | — |
| 2005 | 53° | 35° | 44° | — | — |
| 2004 | 64° | 29° | 46° | — | — |
| 2003 | 66° | 43° | 54° | 0.28" | — |
| 2002 | 42° | 26° | 34° | — | — |
| 2001 | 47° | 18° | 32° | 0.15" | 0.5" |
| 2000 | 42° | 18° | 30° | — | — |
| 1999 | 74° | 20° | 47° | — | — |
| 1998 | 51° | 29° | 40° | — | — |
| 1997 | 73° | 25° | 49° | — | — |
| 1996 | 52° | 28° | 40° | — | — |
| 1995 | 71° | 37° | 54° | — | — |
| 1994 | 75° | 28° | 52° | — | — |
| 1993 | 48° | 22° | 35° | — | — |
| 1992 | 65° | 34° | 49° | — | — |
| 1991 | 34° | 19° | 26° | — | — |
| 1990 | 52° | 22° | 37° | — | — |
| 1989 | 73° | 19° | 46° | — | — |
| 1988coldest | 31° | 10° | 20° | 0.05" | 0.5" |
| 1987 | 35° | 24° | 30° | 0.15" | 3" |
| 1986 | 45° | 34° | 39° | — | — |
| 1985 | 65° | 23° | 44° | — | — |
| 1984 | 48° | 26° | 37° | — | — |
| 1983 | 37° | 24° | 31° | 0.1" | — |
| 1982 | 65° | 26° | 45° | — | — |
| 1981 | 66° | 34° | 50° | — | — |
| 1980 | 34° | 8° | 21° | — | — |
| 1979 | 62° | 31° | 46° | — | — |
| 1978 | 54° | 22° | 38° | — | — |
| 1977 | 57° | 29° | 43° | — | — |
| 1976 | 63° | 24° | 43° | — | — |
| 1975 | 64° | 25° | 44° | — | — |
| 1974 | 62° | 25° | 43° | — | — |
| 1973 | 51° | 25° | 38° | — | — |
| 1972 | 71° | 37° | 54° | — | — |
| 1971 | 53° | 24° | 39° | — | — |
56 years of data from LONGMONT 2 ESE