Historical Weather Records & Monthly Climate for Boulder, CO

All-Time High
104°F
All-Time Low
-13°F
Max Daily Snow
14.3"
Max Daily Rain
1.05"
Max Snow Depth
0

Monthly Climate Averages for Boulder, CO

Based on 30 years of historical data (1994 - 2023)

MonthHigh (°F)Low (°F)Precip (in)Snow (in)
January39°16°0.96"6.7"
February41°16°1.07"7.36"
March50°23°1.9"10.54"
April57°31°2.92"11.71"
May67°41°4.01"4.25"
June78°52°2.64"0.17"
July85°58°2.51"0
August83°57°2.33"0
September75°49°1.94"1.35"
October62°37°1.75"4.69"
November49°25°1.1"6.35"
December40°17°0.94"6.56"

Historical Weather Extremes for Boulder, CO

Based on 80+ years of archive data (1940 - 2024)

🔥
Longest Heatwave
14 Days
2012
Consecutive days ≥ 90°F
🧊
Deepest Freeze
14 Days
1974
Consecutive days ≤ 32°F
🏜️
Longest Drought
30 Days
2012
Consecutive days w/o rain
Wettest Month
4.46"
May 2021
Most rainfall in one month
Snowiest Month
31.75"
April 1957
Most snowfall in one month

More Historical Climate Data for Cities in


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