Historical Weather in Boulder, CO
See 55+ years of weather history for any date in Boulder going back to 1970.
Part of Colorado weather history
Look Up a Specific Date
Today in Boulder Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Boulder, CO, based on 55+ years of weather data.
Warmest MonthJulyAvg High: 87°F / Low: 58°F
Coldest MonthJanuaryAvg High: 45°F / Low: 21°F
Jan
45°/ 21°
💧 3.4"
❄️ 2.2"
Feb
47°/ 22°
💧 3.7"
❄️ 2.2"
Mar
55°/ 29°
💧 6.2"
❄️ 2.7"
Apr
61°/ 35°
💧 7.8"
❄️ 3.0"
May
69°/ 43°
💧 6.7"
❄️ 2.9"
Jun
81°/ 52°
💧 5.0"
Jul
87°/ 58°
💧 4.2"
Aug
85°/ 57°
💧 3.9"
Sep
77°/ 49°
💧 6.2"
❄️ 3.2"
Oct
65°/ 38°
💧 5.3"
❄️ 3.0"
Nov
53°/ 29°
💧 5.3"
❄️ 2.9"
Dec
46°/ 23°
💧 4.2"
❄️ 2.5"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Boulder Temperature Records
- Record High: The hottest temperature ever recorded in Boulder, CO is 106°F, set on July 7, 1973.
- Record Low: The coldest temperature ever recorded in Boulder, CO is -31°F, set on December 22, 1990.
- Data Coverage: Based on 10 years of data from NOAA weather station: BOULDER MUNI AP.
All-Time Record High
106°F
July 7, 1973
All-Time Record Low
-31°F
December 22, 1990
Monthly Temperature Records in Boulder
| Month | Record High | Record Low |
|---|---|---|
| January | 75°F(1982) | -30°F(1984) |
| February | 77°F(1982) | -28°F(1989) |
| March | 85°F(1997) | -12°F(2002) |
| April | 91°F(2022) | -7°F(1975) |
| May | 100°F(2003) | 11°F(2013) |
| June | 106°F(1994) | 28°F(2008) |
| July | 106°F(1973) | 35°F(1978) |
| August | 104°F(1995) | 27°F(2009) |
| September | 101°F(2020) | 15°F(1985) |
| October | 90°F(1980) | -2°F(2019) |
| November | 82°F(2025) | -16°F(1993) |
| December | 77°F(2025) | -31°F(1990) |
Boulder Snow RecordsSee the top 10 snowiest days ever recorded
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