Sullivan County Climate
Sullivan County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.0°F
Annual Precip
44.5"
Annual Snowfall
7.1"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
4,027
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sullivan County
Climate Verdict
Sullivan County has a mild, with an average annual temperature of 57.0°F, moderately wet with 44.5 inches of annual precipitation, occasional hot days — 25.65 per year above 90°F, light snow averaging 7.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 36.6°F. summers are warm — July averages 76.0°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
Sullivan County closely matches the Tennessee statewide average temperature of 58.0°F, it is also noticeably drier, receiving 11.1 inches less precipitation than the state average.
Climate Profile
About Sullivan County Weather
Moderate Temperatures and Manageable Rain
Sullivan County's 57.0°F average annual temperature is slightly higher than the national median. It is drier than many of its peers, with 44.5 inches of annual precipitation.
Cooler and Drier Than Average
At 57.0°F, Sullivan is cooler than the 58.1°F Tennessee state average. It is significantly drier than the state norm, receiving over 11 inches less rain than the state average of 55.9 inches.
The Drier Side of Appalachia
Sullivan County is notably drier than its mountain neighbors to the south. Its 44.5 inches of rain is low for East Tennessee, though it shares the region's characteristic cool winter breezes.
Mild Summers and Crispy Winters
Summers are pleasant with only 26 days of extreme heat and a 74.6°F average. Winters bring a January average of 36.6°F and 7.1 inches of annual snowfall.
Enjoy More Outdoor Days
With only 26 extreme heat days, Sullivan offers more comfortable outdoor time than much of Tennessee. Residents should keep a shovel ready for the 7.1 inches of snow that typically falls each winter.
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.