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Insulation in Kalispell: July highs average about 76°F; January lows average about 17°F.
In Flathead County, July highs average about 76°F and January lows about 17°F, with roughly 36 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 hailstorms, damaging thunderstorm winds and floods in Flathead 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.
Flathead County has had 9 federal disaster declarations in the last 25 years, most often for wildfires; 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.
Columbia Falls · Whitefish · Polson · Hot Springs · Ronan · Eureka · Libby · Plains