Hamilton County Climate
Hamilton County, Ohio
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.5°F
Annual Precip
46.0"
Annual Snowfall
13.7"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,772
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Hamilton County
Climate Verdict
Hamilton County has a mild, with an average annual temperature of 54.5°F, moderately wet with 46.0 inches of annual precipitation, occasional hot days — 24.96666666666667 per year above 90°F, light snow averaging 13.7 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 31.3°F. summers are warm — July averages 75.8°F. The 44°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Hamilton County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Hamilton County is 3.0°F warmer than the Ohio statewide average of 51.5°F, it is somewhat wetter than average for Ohio.
Climate Profile
About Hamilton County Weather
Cincinnati’s Humid Subtropical Influences
Hamilton County’s 54.5°F average annual temperature is notably warmer than the national median. This southern Ohio climate leans toward humid subtropical, characterized by long, warm summers.
Leading the State in Temperature
At 54.5°F, Hamilton is consistently warmer than the 51.5°F Ohio average. It ranks as one of the state's warmest regions due to its southern latitude and urban heat island effects.
Wetter and Warmer than Central Ohio
With 46 inches of annual precipitation, Hamilton is wetter than its northern neighbor, Greene County. It also experiences 25 extreme heat days, far exceeding the state average.
Steamier Summers and Shorter Winters
July averages reach a high of 75.8°F, and residents face 25 days over 90°F annually. Snowfall is light for Ohio, totaling only 13.7 inches per year.
Manage Humidity and High Heat
Homeowners should prioritize dehumidification and robust cooling systems to handle 25 extreme heat days. Winter gear needs are lower here, as annual snow only averages 13.7 inches.
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.