Boulder County Climate
Boulder County, Colorado
Avg Annual Temp
44.0°F
Annual Precip
22.6"
Annual Snowfall
96.0"
Extreme Heat Days
16.939999999999998
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Boulder County Weather
Boulder: Mountain cool on the Front Range
Boulder County averages 44°F annually, running 2 degrees cooler than the U.S. median of 46°F. With 22.6 inches of precipitation and only 17 extreme heat days per year, Boulder represents a cooler, wetter mountain climate despite Front Range proximity.
Colorado's cool alpine counties
At 44°F, Boulder ranks among Colorado's coolest counties, sitting 2 degrees below the state average of 46°F. Elevation and mountain terrain create a distinctly cooler pocket on the Front Range.
Mountain cool beats plains warmth
Boulder (44°F) runs 6.8 degrees cooler than neighboring Adams County (50.7°F) and 9.5 degrees cooler than Bent County (54.6°F). The elevation divide between mountain and plains creates dramatic climate contrasts across a short distance.
Snowy winters, cool summers
Summer temperatures average just 62.2°F while winters drop to 27.3°F, with only 17 days per year reaching 90°F. Annual snowfall of 95.9 inches makes Boulder Colorado's snowiest county on this list, creating a genuine alpine winter.
Heavy snow, minimal cooling needs
With nearly 96 inches of annual snowfall and consistently cool summers, residents prioritize winter-grade heating, insulation, and snow removal over air conditioning. Spring and summer outdoor work stretches short; winter preparation and avalanche awareness dominate the calendar in higher areas.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.