Jefferson County Climate
Jefferson County, Tennessee
Avg Annual Temp
55.9°F
Annual Precip
48.5"
Annual Snowfall
3.0"
Extreme Heat Days
24.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jefferson County Weather
A mild East Tennessee climate
Jefferson County features an annual average temperature of 55.9°F, which is very close to the national climate median. This makes the region cooler and more temperate than much of the Deep South.
Among Tennessee's cooler counties
With an average of 55.9°F, Jefferson County is significantly cooler than the Tennessee state average of 58.1°F. Its location in the Appalachian Valley provides relief from the more intense heat found in West Tennessee.
Drier than the state average
The county receives 48.5 inches of rain annually, which is nearly 7 inches less than the state average. This drier profile distinguishes it from the wetter counties located further west on the Highland Rim.
Temperate summers and mild winters
Extreme heat is less common here, with only 24 days reaching 90°F each year. Winter brings a modest 3.0 inches of snowfall and an average December-to-February temperature of 37.9°F.
Ideal for outdoor recreation
Lower humidity and fewer extreme heat days make this county excellent for outdoor activities during the 73.7°F average summer. Homeowners should plan for occasional winter freezes, though heavy snow accumulation is rare.
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.