Gallia County Climate
Gallia County, Ohio
Avg Annual Temp
54.9°F
Annual Precip
44.5"
Annual Snowfall
—
Extreme Heat Days
32.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Gallia County Weather
Gallia's Subtropical Reach Outpaces National Norms
Gallia County maintains an average annual temperature of 54.9°F, placing it above the national median. This humid subtropical climate experiences significantly warmer baseline conditions than most counties across the United States.
A Warm Outlier in the Buckeye State
While Ohio averages 51.5°F, Gallia is consistently warmer with its 54.9°F mean. This puts the county among the state's warmest southern locales, benefiting from Ohio River valley heat retention.
Hotter and Wetter than Northern Neighbors
Gallia receives 44.5 inches of precipitation annually, exceeding the state average of 41.2 inches. It outpaces central Ohio counties like Guernsey in both temperature and total rainfall.
Intense Summer Heat and Shifting Winters
Residents endure 32 extreme heat days over 90°F annually, significantly more than the regional average. While historical snowfall data is limited, winter temperatures typically average a brisk 34.8°F.
Prioritize Cooling and Water Management
High-efficiency HVAC systems are essential here to combat the month of 90-degree days. Homeowners should also focus on gutter maintenance to handle the county's heavy 44.5-inch annual rainfall.
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.