Ionia County Climate
Ionia County, Michigan
Avg Annual Temp
47.1°F
Annual Precip
35.9"
Annual Snowfall
54.2"
Extreme Heat Days
6.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Ionia County Weather
A Balanced Continental Climate
Ionia County averages 47.1°F annually, a figure that sits below the national median but is common for the Midwest. The area experiences wide seasonal swings from snowy winters to humid summers.
Slightly Warmer than the Norm
The county's 47.1°F annual average is higher than Michigan's state average of 45.7°F. Precipitation is also slightly above the state norm, with 35.9 inches falling annually.
Transitioning to Higher Snowfall
Ionia sees 54.2 inches of annual snowfall, which is higher than central Michigan counties to the east. This increase reflects its position as you move toward the state's western lake-effect snow belts.
Warm Summers, Standard Winters
July averages 70.6°F with about 7 days per year reaching 90°F or hotter. January is typical for the region, averaging 22.3°F with consistent winter precipitation.
Prepare for Varied Precipitation
With 54.2 inches of snow and 35.9 inches of total precipitation, residents need strong winter equipment and moisture-managed roofing. Cooling systems should be ready for the 7 days of extreme summer heat.
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.