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Insulation in Byars: July highs average about 94°F; January lows average about 28°F.
In McClain County, July highs average about 94°F and January lows about 28°F, with roughly 37 inches of rain a year.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and tornadoes in McClain County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
McClain County has had 30 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Dibble Creek 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 McClain County figures — more about homes in Newcastle.
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