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Insulation in Cornelius: July highs average about 78°F; January lows average about 35°F.
In Washington County, July highs average about 78°F and January lows about 35°F, with roughly 56 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 floods, damaging thunderstorm winds and hailstorms in Washington County, with hail up to 0.9 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Washington County has had 11 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Lee Falls Fire (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 Washington County figures — more about homes in Hillsboro.
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