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Insulation in Greendale: July highs average about 81°F; January lows average about 15°F.
In Milwaukee County, July highs average about 81°F and January lows about 15°F, with roughly 34 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 hailstorms, damaging thunderstorm winds and floods in Milwaukee County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Milwaukee County has had 11 federal disaster declarations in the last 25 years, most often for severe storms; 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 Milwaukee County figures — more about homes in Milwaukee.
Greenfield · Hales Corners · Franklin · West Allis · West Milwaukee · Oak Creek · New Berlin · St. Francis