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Insulation in Kewaunee: July highs average about 79°F; January lows average about 11°F.
In Kewaunee County, July highs average about 79°F and January lows about 11°F, with roughly 32 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, floods and hailstorms in Kewaunee County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Kewaunee County has had 4 federal disaster declarations in the last 25 years, most often for public-health emergencies; 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 Kewaunee County figures — more about homes in Algoma.
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