Keweenaw County Climate
Keweenaw County, Michigan
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
41.6°F
Annual Precip
29.6"
Annual Snowfall
—
Extreme Heat Days
1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
1,545
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Keweenaw County
Climate Verdict
Keweenaw County has a cool, averaging 41.6°F annually, moderate rainfall of 29.6 inches per year, rare extreme heat with only 1 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 18.8°F. summers are pleasantly cool with July averaging 64.2°F. The 45°F seasonal variation provides noticeable but manageable change. January is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Keweenaw County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Keweenaw County is 4.0°F cooler than the Michigan statewide average of 45.7°F, it is somewhat drier than average for Michigan.
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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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.