Grundy County Climate
Grundy County, Tennessee
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.9°F
Annual Precip
63.2"
Annual Snowfall
—
Extreme Heat Days
8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,486
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Grundy County
Climate Verdict
Grundy County has a mild, with an average annual temperature of 54.9°F, very wet conditions receiving 63.2 inches of precipitation annually, rare extreme heat with only 7.5 days above 90°F annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 35.4°F. summers are warm — July averages 73.2°F. The 38°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Grundy County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Grundy County is 3.1°F cooler than the Tennessee statewide average of 58.0°F, it is also noticeably wetter, receiving 7.5 inches more precipitation than the state average, the county experiences 28.95992831541217 fewer extreme heat days than the state average.
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 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.