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Insulation in Fillmore: July highs average about 92°F; January lows average about 19°F.
In Millard County, July highs average about 92°F and January lows about 19°F, with roughly 10 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, flash floods and floods in Millard County, with hail up to 0.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Millard County has had 8 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Widemouth 2 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 Millard County figures — more about homes in Delta.
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