Sullivan County Climate
Sullivan County, Tennessee
Avg Annual Temp
57.0°F
Annual Precip
44.5"
Annual Snowfall
7.1"
Extreme Heat Days
25.65
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.