Allegan County Climate
Allegan County, Michigan
Avg Annual Temp
48.3°F
Annual Precip
34.8"
Annual Snowfall
—
Extreme Heat Days
6.85
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Allegan County Weather
A Temperate Pocket in the Midwest
Allegan County averages 48.3°F annually, which is warmer than the Michigan state average but still below the national median. Its location along Lake Michigan helps moderate the extreme cold found further inland.
Warmer Than the State Median
At 48.3°F, Allegan is nearly three degrees warmer than the Michigan state average of 45.7°F. This makes it one of the more temperate counties in the state, offering a slightly longer growing season for local farmers.
The Warm Side of the State
Allegan's 48.3°F average outpaces northern neighbors like Alpena (44.0°F) and Alcona (42.8°F). It shares a similar climate profile with Barry County to the east, though the lake proximity often softens Allegan's winter lows.
Warm Summers and Moderate Winters
July temperatures average 70.7°F, and residents experience roughly 7 days of extreme heat above 90°F annually. While annual snowfall data is not available for this period, winter temperatures average a relatively mild 26.8°F.
Balance Your Seasonal Home Systems
With 7 days of extreme heat and 34.8 inches of precipitation, both central air and reliable sump pumps are wise investments. Residents should prepare for humid summers, as the average temperature reaches 69.2°F during the peak season.
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.