Keweenaw County Climate
Keweenaw County, Michigan
Avg Annual Temp
41.6°F
Annual Precip
29.6"
Annual Snowfall
—
Extreme Heat Days
1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Keweenaw County Weather
The northernmost chill in the state
Keweenaw County averages just 41.6°F annually, placing it among the coldest regions in the United States. Its unique peninsula geography creates a maritime sub-arctic environment.
Far colder than the Michigan average
The county's 41.6°F average is 4.1 degrees colder than the Michigan state average. It is consistently one of the coldest and most remote counties in the Midwest.
Drier but much colder winters
Keweenaw receives 29.6 inches of precipitation, less than the state average of 34.5 inches. However, its July average of 64.2°F is one of the lowest in the region.
Heat is rare in this northern outpost
Keweenaw averages only 1 day per year where temperatures reach 90°F. Winter is the primary season, with an average temperature of 20.9°F and limited available data on total snowfall.
Focus on heating and cold protection
Air conditioning is rarely needed with only one extreme heat day per year. Residents should focus their budget on robust home insulation and high-performance winter clothing.
Frequently Asked Questions
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Track your own weather in Keweenaw County
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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.