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Insulation in Lewistown: July highs average about 83°F; January lows average about 12°F.
In Fergus County, July highs average about 83°F and January lows about 12°F, with roughly 17 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, hailstorms and floods in Fergus County, with hail up to 2.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Fergus County has had 7 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm And Flooding (2024).
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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.
Moore · Hobson · Judith Gap · Denton · Grass Range · Winifred · Stanford · Harlowton