Jefferson County Climate
Jefferson County, Oklahoma
Avg Annual Temp
64.2°F
Annual Precip
32.2"
Annual Snowfall
1.9"
Extreme Heat Days
99.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jefferson County Weather
A Warm Southern Oklahoma Climate
Jefferson County maintains a 64.2°F average annual temperature, which is significantly warmer than the national median. This humid subtropical climate is defined by long, hot summers and very brief, mild winters.
Among Oklahoma's Warmest Regions
The county's average temperature of 64.2°F sits nearly four degrees above the Oklahoma state average of 60.4°F. It ranks as one of the warmest counties in the state, largely due to its southern position along the Red River.
Drier and Hotter Than Eastern Neighbors
Jefferson is notably drier than Johnston County, receiving only 32.2 inches of rain compared to Johnston's 42.4 inches. It also records 23 more extreme heat days per year than its neighbor to the east.
One Hundred Days of Extreme Heat
Summers are intense, with 100 days reaching 90°F or higher and a July average of 84.9°F. Winters are exceptionally mild, averaging 44.9°F with only 1.9 inches of annual snowfall.
Prepare for Prolonged Summer Heat
Residents should invest in high-efficiency cooling systems to handle the three months of extreme heat. Outdoor activities are best scheduled for early morning to avoid the triple-digit heat index common in mid-summer.
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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.