Allegan County Climate
Allegan County, Michigan
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.3°F
Annual Precip
34.8"
Annual Snowfall
—
Extreme Heat Days
7
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,629
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Allegan County
Climate Verdict
Allegan County has a cool, averaging 48.3°F annually, moderate rainfall of 34.8 inches per year, rare extreme heat with only 6.85 days above 90°F annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.4°F. summers are warm — July averages 70.7°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Allegan County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Allegan County closely matches the Michigan statewide average temperature of 45.7°F.
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
What is the average temperature in Allegan County?
How much rain does Allegan County get?
How hot does Allegan County get in summer?
How cold are winters in Allegan County?
Track your own weather in Allegan County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.