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Insulation in Monongah: July highs average about 84°F; January lows average about 22°F; the typical home was built around 1956 (80% before 1980).
In Marion County, July highs average about 84°F and January lows about 22°F, with roughly 46 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 hailstorms in Marion County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Marion County was built around 1956, about 70 years ago, and 80% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Marion County has had 14 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (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 Marion County figures — more about homes in Fairmont.
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