Putnam County Climate
Putnam County, Ohio
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.3°F
Annual Precip
38.3"
Annual Snowfall
21.6"
Extreme Heat Days
14
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,272
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Putnam County
Climate Verdict
Putnam County has a mild, with an average annual temperature of 51.3°F, moderate rainfall of 38.3 inches per year, rare extreme heat with only 14.1 days above 90°F annually, moderate snowfall of 21.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.4°F. summers are warm — July averages 73.9°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Putnam County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Putnam County closely matches the Ohio statewide average temperature of 51.5°F, it is somewhat drier than average for Ohio.
Climate Profile
About Putnam County Weather
Drier and Cooler Than the National Average
Putnam County’s annual average temperature of 51.3°F is lower than the U.S. median. The county receives 38.3 inches of precipitation, which is drier than many other parts of the humid Midwest. This creates a crisp, continental climate with moderate rainfall.
Drier Than the Typical Ohio County
Putnam is notably drier than the state average, receiving 38.3 inches of rain compared to Ohio’s 41.2 inches. Its temperature of 51.3°F is almost identical to the state average of 51.5°F. This makes Putnam one of the less humid areas in the state.
Snowier Than Neighboring Preble County
Putnam County receives 21.6 inches of snow annually, nearly 10 inches more than Preble County to its south. Despite the extra snow, it receives less total precipitation, making it a drier overall environment. Summer heat is similar across both counties, with Putnam recording 14 extreme heat days.
Cold Winters and Frequent Heat Spikes
Putnam winters are chilly, with a January average of 26.4°F and over 21 inches of snow. Summers are warm and see 14 days where temperatures exceed 90°F, peaking with a July average of 73.9°F. The winter average stays below freezing at 29.1°F.
Ready the Snow Shovels and AC
Homeowners should prepare for nearly two feet of annual snow with reliable shovels or blowers. Cooling systems are necessary for the 14 days of extreme summer heat. Because the area is drier than its neighbors, supplemental watering for gardens may be needed in July.
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.