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Insulation in Washington: July highs average about 92°F; January lows average about 28°F; the typical home was built around 2004 (11% before 1980).
In Washington County, July highs average about 92°F and January lows about 28°F, with roughly 15 inches of rain a year.
Over the last 10 years the National Weather Service recorded flash floods, damaging thunderstorm winds and floods in Washington County, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Washington County was built around 2004, about 22 years ago, and 11% were built before 1980.
Washington County has had 12 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Forsyth Fire (2025).
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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 St. George.
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