Clermont County Climate
Clermont County, Ohio
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.8°F
Annual Precip
—
Annual Snowfall
—
Extreme Heat Days
28
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,636
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clermont County
Climate Verdict
Clermont County has a mild, with an average annual temperature of 53.8°F, occasional hot days — 27.8 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 30.4°F. summers are warm — July averages 75.4°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Clermont County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Clermont County closely matches the Ohio statewide average temperature of 51.5°F.
Climate Profile
About Clermont County Weather
Southern Ohio’s Warmer Edge
Clermont County averages 53.8°F, making it warmer than the national median for temperate zones. It occupies a humid continental zone that frequently feels the influence of warmer southern air masses.
One of Ohio’s Warmest Counties
Averaging 53.8°F, Clermont is significantly warmer than the Ohio state average of 51.5°F. This temperature gap reflects its position in the sunnier, southern portion of the state.
Matching the Butler Heat
Clermont mirrors Butler County’s warmth but is considerably hotter than Clinton County, which averages 52.3°F. It experiences more than double the extreme heat days found in northern counties like Coshocton.
A Long Summer Season
The county endures 28 days of temperatures at or above 90°F, contributing to a July average of 75.4°F. Winter remains mild for the state, with a relatively warm December-to-February average of 32.8°F.
Focus on Heat Management
Although snowfall and precipitation records are limited, the 28 extreme heat days make cooling systems a top priority. Residents should plan for higher electricity demand during the peak summer months of June through August.
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.