Delta County Climate
Delta County, Colorado
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.2°F
Annual Precip
13.4"
Annual Snowfall
40.5"
Extreme Heat Days
44
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,835
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Delta County
Climate Verdict
Delta County has a mild, with an average annual temperature of 50.2°F, arid conditions receiving just 13.4 inches of precipitation annually, occasional hot days — 43.73333333333334 per year above 90°F, moderate snowfall of 40.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.5°F. summers are warm — July averages 73.8°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Delta County is 4.4°F warmer than the Colorado statewide average of 45.9°F, it is somewhat drier than average for Colorado, the county experiences 17.117299067775274 more extreme heat days than the state average.
Climate Profile
About Delta County Weather
Delta: Western Slope Valley Climate
At 50.2°F, Delta County is approximately 0.7 degrees below the U.S. median of 49.5°F, placing it squarely in the nation's middle-temperature tier. Its 13.4 inches of annual precipitation fall somewhat below the national median of 15.2 inches, creating a semi-arid valley climate. This western Colorado county reflects the transition between the Rockies and the arid Great Basin.
Delta: Moderate Climate on Western Slope
Delta County's 50.2°F average is 4.2 degrees above Colorado's state average of 46.0°F, ranking it among the warmer counties while still cooler than the eastern plains. Its 13.4 inches of precipitation fall below the state average of 16.0 inches, reflecting the western slope's drier climate. The county's location in the Palisade and Parachute valleys gives it a distinctive warm-arid character.
Warmest Valley on Western Slope
Delta County (50.2°F) is notably warmer than Montrose County to the south (49.1°F estimated) and significantly warmer than high-elevation counties like Ouray and San Juan to the south. Its 44 extreme heat days are fewer than the plains counties but more than mountain neighbors, reflecting its valley location. The county is cooler than Cheyenne and Crowley counties to the east but warmer than alpine zones.
Moderate Heat, Moderate Snow
Delta County experiences 44 days per year above 90°F—a moderate heat load—with July averaging 73.8°F and January dropping to 27.5°F. Annual snowfall totals 40.5 inches, moderate for western Colorado and concentrated in winter months from November through March. The summer-to-winter swing of 46 degrees demands versatile preparation.
Plan for Valley Sun and Winter Snow
Residents need functional air conditioning for 44 annual days above 90°F, plus adequate heating for winter lows around 27°F and 40.5 inches of seasonal snow. The valley's dry air (13.4 inches annual precipitation) requires attention to landscape irrigation and indoor humidification during winter heating. Outdoor recreation peaks in spring (April–May) and fall (September–October) when temperatures sit in the comfortable 60–70°F range; summer activities are best scheduled for early morning or evening.
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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.