Historical Weather in Longmont, CO
See 55+ years of weather history for any date in Longmont going back to 1970.
Part of Colorado weather history
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Today in Longmont Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Longmont, CO, based on 55+ years of weather data.
Warmest MonthJulyAvg High: 88°F / Low: 57°F
Coldest MonthJanuaryAvg High: 44°F / Low: 18°F
Jan
44°/ 18°
💧 3.3"
❄️ 2.1"
Feb
47°/ 20°
💧 3.5"
❄️ 2.1"
Mar
55°/ 28°
💧 6.2"
❄️ 2.6"
Apr
63°/ 34°
💧 7.4"
❄️ 2.9"
May
71°/ 43°
💧 6.7"
❄️ 2.5"
Jun
83°/ 52°
💧 5.4"
Jul
88°/ 57°
💧 4.3"
Aug
87°/ 56°
💧 4.2"
Sep
79°/ 47°
💧 5.9"
❄️ 3.1"
Oct
66°/ 36°
💧 5.0"
❄️ 2.8"
Nov
53°/ 26°
💧 5.0"
❄️ 2.7"
Dec
46°/ 20°
💧 4.0"
❄️ 2.5"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Longmont Temperature Records
- Record High: The hottest temperature ever recorded in Longmont, CO is 106°F, set on July 7, 1973.
- Record Low: The coldest temperature ever recorded in Longmont, CO is -31°F, set on December 22, 1990.
- Data Coverage: Based on 57 years of data from NOAA weather station: LONGMONT 2 ESE.
All-Time Record High
106°F
July 7, 1973
All-Time Record Low
-31°F
December 22, 1990
Monthly Temperature Records in Longmont
| Month | Record High | Record Low |
|---|---|---|
| January | 75°F(1982) | -30°F(1984) |
| February | 77°F(1982) | -28°F(1989) |
| March | 85°F(1997) | -14°F(1989) |
| April | 91°F(2022) | -7°F(1975) |
| May | 100°F(2003) | 10°F(2013) |
| June | 106°F(1994) | 18°F(2014) |
| July | 106°F(1973) | 35°F(2024) |
| August | 104°F(1995) | 37°F(1992) |
| September | 103°F(2019) | 15°F(1985) |
| October | 90°F(1980) | -8°F(2020) |
| November | 82°F(2025) | -16°F(1993) |
| December | 77°F(2025) | -31°F(1990) |
Longmont Snow RecordsSee the top 10 snowiest days ever recorded
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