Arapahoe County Climate
Arapahoe County, Colorado
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.8°F
Annual Precip
—
Annual Snowfall
—
Extreme Heat Days
47
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,800
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Arapahoe County
Climate Verdict
Arapahoe County has a mild, with an average annual temperature of 50.8°F, occasional hot days — 46.6 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.1°F. summers are warm — July averages 73.4°F. The 41°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Arapahoe County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Arapahoe County is 4.9°F warmer than the Colorado statewide average of 45.9°F, the county experiences 19.983965734441934 more extreme heat days than the state average.
Climate Profile
About Arapahoe County Weather
Arapahoe: Urban heat on the plains
Arapahoe County averages 50.8°F annually, running 4.8 degrees warmer than the U.S. median of 46°F. The county's semi-arid climate and Denver metro location create a warm, dry environment, though detailed precipitation records are limited.
Colorado's warmest tier
At 50.8°F, Arapahoe ranks among Colorado's warmest counties, sitting 4.8 degrees above the state average of 46°F. This reflects its Front Range elevation and the urban heat-island effect from the Denver metropolitan area.
Metro core shapes temperature
Arapahoe (50.8°F) nearly matches adjacent Adams County (50.7°F) and runs significantly warmer than surrounding mountain counties like Boulder (44°F). The metro sprawl creates a distinct warm corridor across the northern Front Range.
Hot summers, quick winters
Summer temperatures average 70.6°F while winters drop to 32.7°F, with 47 days per year reaching 90°F or higher. January averages 32.1°F, and while annual snowfall data is limited, winter precipitation is moderate by plains standards.
Cool homes, lighter winter prep
With 47 annual extreme heat days, air conditioning is essential and high-efficiency systems save significantly on summer costs. Winter demands solid heating but is less severe than mountain counties; water-efficient landscaping suits the dry climate.
Frequently Asked Questions
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.