Mercer County Climate
Mercer County, Ohio
Avg Annual Temp
51.4°F
Annual Precip
38.9"
Annual Snowfall
28.8"
Extreme Heat Days
11.7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mercer County Weather
Standard Midwestern Climate Trends
Mercer County records an annual average temperature of 51.4°F, placing it right in line with the national median. This provides a balanced climate typical of the American interior.
Reflecting the Ohio Average
With an average temperature nearly identical to the state's 51.5°F, Mercer serves as a climatic benchmark for Ohio. It avoids the extremes found in the lake-effect north or the humid south.
Drier Fields in Western Ohio
The county sees 38.9 inches of annual precipitation, which is lower than the Ohio average of 41.2 inches. This drier profile distinguishes Mercer from its eastern neighbors that face heavier rainfall.
Consistent Snow and Warm Summers
Mercer faces 28.8 inches of annual snowfall and a chilly January average of 26.2°F. Summer brings a July average of 73.4°F and 12 days where the thermometer hits 90°F or higher.
Balanced Seasonal Preparation Required
Residents should invest in both reliable snow tires for the 28.8 inches of snow and efficient cooling for the 12 extreme heat days. Managing the 38.9 inches of rain is generally straightforward compared to wetter state regions.
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.