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Insulation in Caseyville: July highs average about 89°F; January lows average about 23°F.
In St. Clair County, July highs average about 89°F and January lows about 23°F, with roughly 42 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in St. Clair County, with hail up to 2.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
St. Clair County has had 9 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Storms, Tornadoes, Straight-Line Winds, And Floodng (2024).
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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 St. Clair County figures — more about homes in Belleville.
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