Delta County Climate
Delta County, Colorado
Avg Annual Temp
50.2°F
Annual Precip
13.4"
Annual Snowfall
40.5"
Extreme Heat Days
43.73333333333334
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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.
Frequently Asked Questions
What is the average temperature in Delta County?
How much rain does Delta County get?
Does it snow in Delta County?
How hot does Delta County get in summer?
How cold are winters in Delta County?
Track your own weather in Delta County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.