Jefferson County Climate
Jefferson County, Georgia
Avg 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
Seasonal Overview
National Comparison
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 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.