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Insulation in Sparta: July highs average about 81°F; January lows average about 24°F.
In Alleghany County, July highs average about 81°F and January lows about 24°F, with roughly 54 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 Alleghany County, with hail up to 1.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Alleghany County has had 17 federal disaster declarations in the last 25 years, most often for hurricanes; 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.
Jefferson · Lansing · Ronda · West Jefferson · Elkin · North Wilkesboro · Dobson · Jonesville