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Insulation in Island: July highs average about 89°F; January lows average about 26°F.
In McLean County, July highs average about 89°F and January lows about 26°F, with roughly 48 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods, damaging thunderstorm winds and hailstorms in McLean 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.
McLean County has had 21 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (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 McLean County figures — more about homes in Livermore.
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