Harmon County Climate
Harmon County, Oklahoma
Avg Annual Temp
60.4°F
Annual Precip
25.9"
Annual Snowfall
3.3"
Extreme Heat Days
101.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Harmon County Weather
Dry heat in the southwest
Harmon County sits exactly at the Oklahoma state average of 60.4°F for annual temperature. Its climate is defined by aridity, receiving only 25.9 inches of annual precipitation.
Perfectly average temperature, below average rain
Harmon perfectly mirrors the statewide temperature average of 60.4°F. While its temperature is standard, its low rainfall of 25.9 inches puts it among the state's driest regions.
Drier than its neighbors
Harmon is even drier than neighbor Greer County, with about an inch less rain per year. It is one of the few counties in the region to break the 100-day mark for extreme heat.
Triple-digit heat days
Heat is the dominant story here, with 101 days reaching at least 90°F every year. Winters are manageable, featuring a 39.6°F average and only 3.3 inches of snowfall.
Prioritize water and sun safety
With over 100 days of extreme heat, efficient air conditioning and sun protection are essential. Residents should also plan for water conservation given the low 25.9-inch annual rainfall.
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.