Jefferson County Climate
Jefferson County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
55.9°F
Annual Precip
48.5"
Annual Snowfall
3.0"
Extreme Heat Days
24
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
3,763
Supports most vegetables & fruits
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 mild, with an average annual temperature of 55.9°F, moderately wet with 48.5 inches of annual precipitation, occasional hot days — 24.2 per year above 90°F, light snow averaging 3.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 35.9°F. summers are warm — July averages 75.0°F. The 39°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 Tennessee statewide average temperature of 58.0°F, it is also noticeably drier, receiving 7.1 inches less precipitation than the state average.
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 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.