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Insulation in Shelburn: July highs average about 87°F; January lows average about 22°F.
In Sullivan County, July highs average about 87°F and January lows about 22°F, with roughly 46 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 flash floods in Sullivan County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Sullivan County has had 13 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 Sullivan County figures — more about homes in Sullivan.
Farmersburg · Hymera · Sullivan · Dugger · Jasonville · Merom · Carlisle · Riley