Mercer County Climate
Mercer County, Kentucky
Avg Annual Temp
57.0°F
Annual Precip
45.9"
Annual Snowfall
—
Extreme Heat Days
27.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.