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Insulation in Midvale: July highs average about 88°F; January lows average about 21°F.
In Washington County, July highs average about 88°F and January lows about 21°F, with roughly 21 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 and damaging thunderstorm winds in Washington County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Washington County has had 6 federal disaster declarations in the last 25 years, most often for public-health emergencies; the latest was Tartar Fire (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 Weiser.
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