Mackinac County Climate
Mackinac County, Michigan
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
43.0°F
Annual Precip
35.0"
Annual Snowfall
80.9"
Extreme Heat Days
1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
1,791
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Mackinac County
Climate Verdict
Mackinac County has a cool, averaging 43.0°F annually, moderate rainfall of 35.0 inches per year, rare extreme heat with only 0.5 days above 90°F annually, heavy winter snowfall averaging 80.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.3°F. summers are pleasantly cool with July averaging 66.3°F. The 48°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Mackinac County closely matches the Michigan statewide average temperature of 45.7°F.
Climate Profile
About Mackinac County Weather
Cold Shores and High Snow
Mackinac County averages 43.0°F annually, placing it among the colder counties in the United States. Its climate is heavily dictated by the surrounding Great Lakes and northern latitude.
A True Northern Michigan Climate
The county's 43.0°F average is significantly cooler than the statewide average of 45.7°F. It represents the transition from the Lower Peninsula to the more rugged Upper Peninsula.
Warmer Than the Deep U.P.
Mackinac is more temperate than Luce County to the north, beating it by about one degree annually. However, it receives more precipitation than its northern neighbor, totaling 35.0 inches per year.
Endless Winter and Mild July
The county sees 80.9 inches of snow annually, while summer heat is almost non-existent with only one day reaching 90°F. January averages a cold 18.3°F, making winter the primary weather concern.
Prepare for Lake-Effect Snow
Residents must maintain equipment capable of clearing 81 inches of snow throughout the season. Air conditioning is rarely needed, but high-performance insulation is vital for the 21.2°F winter average.
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.