Dewey County Climate
Dewey County, Oklahoma
Avg Annual Temp
58.0°F
Annual Precip
27.7"
Annual Snowfall
7.9"
Extreme Heat Days
84.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Dewey County Weather
Warm and Relatively Arid Profile
Dewey County's 58.0°F average is warmer than the national median but cooler than much of Oklahoma. It receives only 27.7 inches of rain annually.
Cooler and Drier Than State Norms
At 58.0°F, Dewey is cooler than the 60.4°F state average. It also faces a significant rain deficit compared to the 37.2-inch state average.
Snowier Than Its Southern Neighbors
The county records 7.9 inches of annual snowfall, which is higher than many nearby regions. Its dry climate is typical of northwestern Oklahoma.
Hot Summers with Cold Winters
Dewey County sees 85 days of temperatures above 90°F. Winter averages are a cold 36.6°F, marking it as a region of wide seasonal swings.
Prepare for Wide Temperature Extremes
Homeowners must plan for 81.5°F July peaks and the 7.9 inches of snow. Winterize pipes and maintain reliable heating for the colder-than-average winters.
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.