Mackinac County Climate
Mackinac County, Michigan
Avg Annual Temp
43.0°F
Annual Precip
35.0"
Annual Snowfall
80.9"
Extreme Heat Days
0.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.