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Insulation in Ishpeming: July highs average about 78°F; January lows average about 6°F.
In Marquette County, July highs average about 78°F and January lows about 6°F, with roughly 33 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and floods in Marquette County, with hail up to 3.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Marquette County has had 6 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Storms, Tornadoes, And Flooding (2026).
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Uneven rooms, high bills and an attic you can see the joists in are the signs; older homes often have far too little.
Attic insulation and air-sealing usually pay back fastest.
These are Marquette County figures — more about homes in Marquette.
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