Jefferson County Climate
Jefferson County, Georgia
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
63.5°F
Annual Precip
47.6"
Annual Snowfall
0.4"
Extreme Heat Days
79
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
5,558
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 63.5°F year-round, moderately wet with 47.6 inches of annual precipitation, significant summer heat with 79 days annually above 90°F, light snow averaging 0.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 45.5°F. summers are hot, with July averaging 80.8°F. The 35°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Jefferson County closely matches the Georgia statewide average temperature of 63.7°F, it is somewhat drier than average for Georgia.
Climate Profile
About Jefferson County Weather
Classic Southern Thermal Profile
Jefferson County's annual average temperature of 63.5°F is well above the national median. It experiences the long, warm growing seasons typical of the American South.
Matching the State Average
The county's 63.5°F average nearly mirrors the Georgia state average of 63.7°F. It serves as a perfect representative of the state's overall climate.
Drier Than State Benchmarks
Jefferson sees 47.6 inches of rain, less than the state average of 51.4 inches. It is slightly cooler than neighboring Johnson County, which averages 64.0°F.
Seventy-Nine Days of Heat
Summer temperatures peak at 80.8°F in July, contributing to 79 days of extreme heat annually. Winter remains crisp but manageable with a 47.3°F average and minimal snow.
Plan for Humid Summers
Expect high humidity and 79 days of temperatures over 90°F, making summer cooling a major household expense. The 0.4 inches of snow is rare, so focus on heat-tolerant landscaping.
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.