Weather on May 15
Longmont, CO
55 Years of Data
Avg High
72°F
Avg Low
43°F
Warmest
1991
71°F avg
Coldest
1983
38°F avg
About This Date
May 15th in Longmont, CO typically brings pleasant spring weather, with average highs around 72°F and lows near 43°F — a 29°F daily swing. Over 54 years of records, the warmest May 15th was in 1991 (71°F average), while the coldest was 1983 (38°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 15th dates historically, with the wettest May 15th recording 1.47" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 15th in Longmont, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 42° | 59° | 1.3" | — |
| 2024 | 80° | 47° | 63° | 0.1" | — |
| 2023 | 61° | 48° | 54° | 0.23" | — |
| 2022 | 84° | 49° | 66° | — | — |
| 2021 | 72° | 47° | 59° | — | — |
| 2020 | 70° | 50° | 60° | 0.05" | — |
| 2019 | 84° | 46° | 65° | — | — |
| 2018 | 68° | 42° | 55° | 0.05" | — |
| 2017 | 77° | 46° | 62° | — | — |
| 2016 | 52° | 38° | 45° | 0.3" | — |
| 2015 | 68° | 44° | 56° | 0.43" | — |
| 2014 | 61° | 34° | 47° | — | — |
| 2013 | 80° | 53° | 67° | — | — |
| 2012 | 78° | 43° | 60° | — | — |
| 2011 | 45° | 34° | 39° | 0.89" | — |
| 2010 | 61° | 37° | 49° | 0.53" | — |
| 2008 | 59° | 41° | 50° | 0.64" | — |
| 2007 | 68° | 45° | 56° | 0.58" | — |
| 2006 | 72° | 39° | 55° | — | — |
| 2005 | 73° | 41° | 57° | — | — |
| 2004 | 64° | 42° | 53° | — | — |
| 2003 | 75° | 50° | 63° | — | — |
| 2002 | 79° | 38° | 58° | — | — |
| 2001 | 85° | 44° | 64° | — | — |
| 2000 | 74° | 39° | 56° | — | — |
| 1999 | 72° | 45° | 58° | 0.05" | — |
| 1998 | 73° | 42° | 58° | 0.05" | — |
| 1997 | 69° | 37° | 53° | 0.25" | — |
| 1996 | 92° | 48° | 70° | — | — |
| 1995 | 65° | 35° | 50° | — | — |
| 1994 | 70° | 39° | 54° | — | — |
| 1993 | 78° | 48° | 63° | — | — |
| 1992 | 82° | 45° | 63° | — | — |
| 1991warmest | 88° | 55° | 71° | — | — |
| 1990 | 68° | 40° | 54° | — | — |
| 1989 | 52° | 38° | 45° | 1.47" | — |
| 1988 | 88° | 44° | 66° | — | — |
| 1987 | 83° | 52° | 67° | — | — |
| 1986 | 63° | 44° | 53° | 0.76" | — |
| 1985 | 71° | 37° | 54° | — | — |
| 1984 | 78° | 50° | 64° | — | — |
| 1983coldest | 43° | 33° | 38° | 0.1" | — |
| 1982 | 58° | 36° | 47° | 0.08" | — |
| 1981 | 74° | 44° | 59° | — | — |
| 1980 | 65° | 45° | 55° | 0.3" | — |
| 1979 | 75° | 45° | 60° | — | — |
| 1978 | 88° | 50° | 69° | — | — |
| 1977 | 68° | 47° | 57° | — | — |
| 1976 | 87° | 48° | 68° | — | — |
| 1975 | 76° | 46° | 61° | — | — |
| 1974 | 69° | 38° | 53° | — | — |
| 1973 | 64° | 37° | 51° | — | — |
| 1972 | 79° | 42° | 60° | — | — |
| 1971 | 73° | 44° | 59° | — | — |
54 years of data from LONGMONT 2 ESE