Weather on June 15
Longmont, CO
55 Years of Data
Avg High
85°F
Avg Low
51°F
Warmest
2021
79°F avg
Coldest
1976
55°F avg
About This Date
June 15th in Longmont, CO typically brings warm summer weather, with average highs around 85°F and lows near 51°F — a 34°F daily swing. Over 55 years of records, the warmest June 15th was in 2021 (79°F average), while the coldest was 1976 (55°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 18% of June 15th dates historically, with the wettest June 15th recording 0.74" of rain. The last decade has been 6.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.0°F warmer on this date compared to 20-30 years ago.
Planning for June 15th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 95° | 57° | 76° | — | — |
| 2024 | 80° | 59° | 70° | 0.03" | — |
| 2023 | 81° | 52° | 66° | — | — |
| 2022 | 85° | 52° | 68° | — | — |
| 2021warmest | 98° | 60° | 79° | — | — |
| 2020 | 92° | 53° | 72° | — | — |
| 2019 | 81° | 53° | 67° | — | — |
| 2018 | 97° | 60° | 78° | — | — |
| 2017 | 89° | 51° | 70° | — | — |
| 2016 | 89° | 52° | 70° | — | — |
| 2015 | 79° | 53° | 66° | — | — |
| 2014 | 76° | 41° | 58° | — | — |
| 2013 | 83° | 52° | 67° | — | — |
| 2012 | 84° | 57° | 71° | 0.15" | — |
| 2011 | 88° | 49° | 68° | — | — |
| 2010 | 78° | 45° | 61° | — | — |
| 2009 | 68° | 47° | 57° | 0.74" | — |
| 2008 | 86° | 52° | 69° | — | — |
| 2007 | 88° | 49° | 68° | — | — |
| 2006 | 95° | 55° | 75° | — | — |
| 2005 | 81° | 49° | 65° | 0.05" | — |
| 2004 | 85° | 54° | 69° | — | — |
| 2003 | 83° | 57° | 70° | — | — |
| 2002 | 85° | 50° | 67° | — | — |
| 2001 | 71° | 45° | 58° | — | — |
| 2000 | 90° | 56° | 73° | — | — |
| 1999 | 74° | 45° | 59° | 0.15" | — |
| 1998 | 79° | 40° | 59° | 0.15" | — |
| 1997 | 82° | 45° | 63° | 0.03" | — |
| 1996 | 87° | 59° | 73° | — | — |
| 1995 | 94° | 53° | 73° | — | — |
| 1994 | 101° | 45° | 73° | — | — |
| 1993 | 88° | 55° | 71° | — | — |
| 1992 | 79° | 56° | 67° | — | — |
| 1991 | 84° | 50° | 67° | 0.64" | — |
| 1990 | 85° | 53° | 69° | — | — |
| 1989 | 67° | 45° | 56° | — | — |
| 1988 | 77° | 50° | 64° | 0.64" | — |
| 1987 | 92° | 53° | 72° | — | — |
| 1986 | 91° | 50° | 71° | — | — |
| 1985 | 88° | 53° | 70° | — | — |
| 1984 | 88° | 55° | 71° | — | — |
| 1983 | 72° | 43° | 57° | — | — |
| 1982 | 74° | 52° | 63° | — | — |
| 1981 | 66° | 44° | 55° | — | — |
| 1980 | 94° | 52° | 73° | — | — |
| 1979 | 91° | 57° | 74° | — | — |
| 1978 | 97° | 52° | 74° | — | — |
| 1977 | 96° | 52° | 74° | — | — |
| 1976coldest | 66° | 44° | 55° | — | — |
| 1975 | 87° | 46° | 67° | — | — |
| 1974 | 93° | 57° | 75° | — | — |
| 1973 | 81° | 55° | 68° | 0.05" | — |
| 1972 | 84° | 50° | 67° | — | — |
| 1971 | 86° | 51° | 69° | — | — |
55 years of data from LONGMONT 2 ESE