Mercer County Climate
Mercer County, Kentucky
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
57.0°F
Annual Precip
45.9"
Annual Snowfall
—
Extreme Heat Days
28
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
4,197
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Mercer County
Climate Verdict
Mercer County has a mild, with an average annual temperature of 57.0°F, moderately wet with 45.9 inches of annual precipitation, occasional hot days — 27.6 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 35.9°F. summers are warm — July averages 76.8°F. The 41°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
Mercer County closely matches the Kentucky statewide average temperature of 56.0°F, it is somewhat drier than average for Kentucky.
Climate Profile
About Mercer County Weather
Warmer and Drier Than the State Average
Mercer County averages 57.0°F annually, making it slightly warmer than the Kentucky state average of 56.2°F. The county receives 45.9 inches of rain, which is lower than the typical state-wide total of 50.6 inches.
One of Kentucky's Warmer Localities
At 57.0°F, Mercer sits nearly a full degree above the state median temperature. It ranks as one of the warmer counties in the Bluegrass region while remaining slightly drier than its neighbors.
Drier Fields Than Neighboring Nelson County
Mercer’s 45.9 inches of annual rainfall is significantly lower than Nelson County’s 51.6 inches. This relative dryness can influence local gardening and agricultural water needs during the peak summer months.
Hot Summers and Mild Winter Temperatures
The county faces 28 days of extreme heat over 90°F, with July temperatures averaging 76.8°F. Winters are relatively mild, featuring a January average of 35.9°F, though specific snowfall records are limited.
Cooling Systems and Seasonal Irrigation
Efficient air conditioning is essential to handle nearly a month of 90°F weather. Gardeners should plan for supplemental irrigation since the county receives less rain than much of the rest of Kentucky.
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.