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Insulation in Fairfield: July highs average about 79°F; January lows average about 13°F.
In Teton County, July highs average about 79°F and January lows about 13°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 Teton County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Teton County has had 8 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm And Straight-Line Winds (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 Teton County figures — more about homes in Choteau.
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