Williamson County Climate
Williamson County, Tennessee
Avg Annual Temp
59.0°F
Annual Precip
55.3"
Annual Snowfall
2.6"
Extreme Heat Days
48.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Williamson County Weather
Warm and Growing Seasons
Williamson County’s 59.0°F annual average is much higher than the national median. This warmth supports a long growing season and a characteristic Southern climate.
Among Tennessee's Warmer Counties
At 59.0°F, Williamson is nearly a full degree warmer than the state average of 58.1°F. It ranks as one of the warmer urban-adjacent counties in the state.
Warmer Than Surrounding Rural Areas
Williamson is warmer than Trousdale (57.9°F) and White County (58.0°F). Its climate is more consistent with the lower-elevation basins of Middle Tennessee.
Significant Summer Heat Peaks
The county sees 48 days of temperatures reaching 90°F or higher, with a July average of 78.9°F. Winters are mild with only 2.6 inches of annual snowfall.
Focus on Summer Electricity Costs
The 48 days of extreme heat mean air conditioning units will work overtime for nearly two months of the year. Minimal snowfall of 2.6 inches means winter road prep is only occasionally necessary.
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.