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Insulation in Johnson: July highs average about 89°F; January lows average about 27°F.
In Washington County, July highs average about 89°F and January lows about 27°F, with roughly 49 inches of rain a year.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and flash floods in Washington County, with hail up to 5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Washington County has had 14 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 Washington County figures — more about homes in Fayetteville.
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