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Insulation in Seymour: July highs average about 81°F; January lows average about 9°F.
In Outagamie County, July highs average about 81°F and January lows about 9°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 tornadoes in Outagamie County, with hail up to 4.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Outagamie County has had 7 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Storms And Tornadoes (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 Outagamie County figures — more about homes in Appleton.
Black Creek · Nichols · Hobart · Pulaski · Ashwaubenon · Howard · Shiocton · De Pere