Weather on March 18
Longmont, CO
55 Years of Data
Avg High
56°F
Avg Low
28°F
Warmest
2007
60°F avg
Coldest
1988
22°F avg
About This Date
March 18th 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 18th was in 2007 (60°F average), while the coldest was 1988 (22°F) — a 38°F range across recorded history. Precipitation has occurred on 13% of recorded March 18th dates, with snow falling 5% of the time (heaviest snowfall: 10.5"). 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 18th in Longmont, CO? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 76° | 31° | 53° | — | — |
| 2025 | 71° | 39° | 55° | — | — |
| 2024 | 50° | 27° | 38° | — | — |
| 2023 | 46° | 15° | 31° | — | — |
| 2022 | 41° | 22° | 31° | 0.18" | — |
| 2021 | 44° | 19° | 32° | — | — |
| 2020 | 56° | 30° | 43° | — | — |
| 2019 | 56° | 26° | 41° | — | — |
| 2018 | 66° | 27° | 46° | — | — |
| 2017 | 80° | 36° | 58° | — | — |
| 2016 | 30° | 21° | 26° | 2.16" | 10.5" |
| 2015 | 64° | 36° | 50° | — | — |
| 2014 | 57° | 30° | 44° | — | — |
| 2013 | 48° | 31° | 39° | — | — |
| 2012 | 70° | 39° | 54° | — | — |
| 2011 | 56° | 31° | 43° | 0.1" | 0.1" |
| 2010 | 65° | 35° | 50° | — | — |
| 2009 | 68° | 38° | 53° | — | — |
| 2008 | 49° | 22° | 35° | — | — |
| 2007warmest | 76° | 45° | 60° | — | — |
| 2006 | 49° | 21° | 35° | — | — |
| 2005 | 49° | 29° | 39° | — | — |
| 2004 | 71° | 35° | 53° | — | — |
| 2003 | 47° | 34° | 40° | 3.96" | 4" |
| 2002 | 50° | 18° | 34° | — | — |
| 2001 | 41° | 21° | 31° | — | — |
| 2000 | 49° | 18° | 33° | — | — |
| 1999 | 53° | 19° | 36° | — | — |
| 1998 | 57° | 30° | 44° | 0.48" | — |
| 1997 | 70° | 26° | 48° | — | — |
| 1996 | 45° | 26° | 35° | — | — |
| 1995 | 63° | 31° | 47° | — | — |
| 1994 | 69° | 30° | 50° | — | — |
| 1993 | 33° | 22° | 27° | — | — |
| 1992 | 47° | 32° | 39° | — | — |
| 1991 | 52° | 23° | 37° | — | — |
| 1990 | 51° | 25° | 38° | — | — |
| 1989 | 58° | 12° | 35° | — | — |
| 1988coldest | 33° | 11° | 22° | — | — |
| 1987 | 40° | 27° | 33° | — | — |
| 1986 | 42° | 24° | 33° | — | — |
| 1985 | 65° | 29° | 47° | — | — |
| 1984 | 61° | 28° | 44° | — | — |
| 1983 | 29° | 23° | 26° | — | — |
| 1982 | 64° | 31° | 47° | — | — |
| 1981 | 57° | 26° | 42° | 0.38" | — |
| 1980 | 52° | 19° | 35° | — | — |
| 1979 | 61° | 33° | 47° | 0.25" | — |
| 1978 | 72° | 31° | 51° | — | — |
| 1977 | 54° | 30° | 42° | — | — |
| 1976 | 68° | 31° | 49° | — | — |
| 1975 | 57° | 34° | 45° | — | — |
| 1974 | 74° | 39° | 56° | — | — |
| 1973 | 64° | 27° | 45° | — | — |
| 1972 | 68° | 27° | 47° | — | — |
| 1971 | 58° | 24° | 41° | — | — |
56 years of data from LONGMONT 2 ESE