Boulder, CO All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Boulder, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 102°F (39°C) | June 23, 2012 and July 26, 2026 |
| Record Low | -23.9°F (-31°C) | February 5, 1989 and December 22, 1990 |
| Lowest High | -11.9°F (-24°C) | February 4, 1989 |
| Highest Low | 75°F (24°C) | July 10, 2025 and July 27, 2026 |
| Highest Mean | 85.5°F (30°C) | July 19, 2022 |
| Lowest Mean | -14.9°F (-26°C) | February 4, 1989 |
| Precipitation | ||
| Max in One Calendar Day | 9.08" (230.6 mm) | September 12, 2013 |
| Max in One Month | 18.16" (461.3 mm) | September 2013 |
| Least in One Month | 0.00" (0.0 mm) | May 1974 |
| Max in One Year | 34.17" (867.8 mm) | 2013 |
| Least in One Year | 13.46" (341.9 mm) | 1980 |
| Snowfall | ||
| Max in One Calendar Day | 22.1" (56.1 cm) | October 25, 1997 |
| Max in One Month | 56.8" (144.2 cm) | March 1970 |
| Max in One Season | 152.0" (386.2 cm) | 2019-20 |
| Max in One Year | 158.9" (403.6 cm) | 1997 |
| Earliest Snow | 1.7" (4.3 cm) | September 8, 2020 |
| Earliest Measurable Snow | 1.7" (4.3 cm) | September 8, 2020 |
| Latest Snow | 0.8" (2.0 cm) | May 24, 1995 |
| Latest Measurable Snow | 0.8" (2.0 cm) | May 24, 1995 |
| Period of Record | ||
| Temperature | January 1, 1970 – August 1, 2026 | |
| Precipitation | January 1, 1970 – August 1, 2026 | |
| Snowfall | January 1, 1970 – August 1, 2026 | |
Note: Records compiled from NOAA GHCN-Daily observations at BOULDER (5 mi from Boulder, CO). Quality-flagged readings are excluded. Monthly and annual totals require substantially complete reporting for “least” records.
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Frequently Asked Questions
What is the hottest temperature ever recorded in Boulder, CO?
The all-time record high in Boulder, CO is 102°F (39°C), set on June 23, 2012 and July 26, 2026.
What is the coldest temperature ever recorded in Boulder, CO?
The all-time record low in Boulder, CO is -23.9°F (-31°C), set on February 5, 1989 and December 22, 1990.
What is the most rain Boulder, CO has ever had in one day?
The most precipitation recorded in one calendar day near Boulder, CO is 9.08 inches, on September 12, 2013.
What is the biggest snowfall ever recorded in Boulder, CO?
The most snow recorded in one calendar day near Boulder, CO is 22.1 inches, on October 25, 1997.
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Boulder Weather History
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Colorado Weather Extremes
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