Jefferson County Climate
Jefferson County, Oklahoma
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
64.2°F
Annual Precip
32.2"
Annual Snowfall
1.9"
Extreme Heat Days
100
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
5,983
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jefferson County
Climate Verdict
Jefferson County has a warm, averaging 64.2°F year-round, moderate rainfall of 32.2 inches per year, significant summer heat with 99.8 days annually above 90°F, light snow averaging 1.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 43.1°F. summers are hot, with July averaging 84.9°F. The 42°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Jefferson County is 3.8°F warmer than the Oklahoma statewide average of 60.4°F, it is also noticeably drier, receiving 5.0 inches less precipitation than the state average, the county experiences 23.389050925925886 more extreme heat days than the state average.
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.
Frequently Asked Questions
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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.