Grundy County Climate
Grundy County, Tennessee
Avg Annual Temp
54.9°F
Annual Precip
63.2"
Annual Snowfall
—
Extreme Heat Days
7.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Grundy County Weather
Cool Plateau Weather Patterns
Grundy County's 54.9°F average temperature is very close to the national median. It is characterized by heavy annual precipitation, totaling a significant 63.2 inches.
One of Tennessee's Coolest Counties
Grundy ranks well below the Tennessee state average of 58.1°F. Its position on the plateau keeps it substantially cooler than the low-lying river valleys nearby.
The Wettest in the Region
Grundy's 63.2 inches of rain surpasses neighbors like Franklin and Hamilton. It is also nearly 4 degrees cooler on average than Hamilton County.
Very Few Extreme Heat Days
The county only sees 8 days of extreme heat above 90°F, offering some of the most comfortable summers in the state. While specific snowfall data is limited, the 35.4°F January average suggests cold, crisp winters.
Gear Up for Heavy Rain
Reliable waterproof gear and high-capacity drainage systems are essential for the 63-inch annual rainfall. You can save on cooling costs here, as 90-degree days are relatively 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.