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Insulation in Thompson Falls: July highs average about 80°F; January lows average about 20°F.
In Sanders County, July highs average about 80°F and January lows about 20°F, with roughly 32 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 floods, hailstorms and damaging thunderstorm winds in Sanders County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Sanders County has had 10 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.
Plains · Hot Springs · Superior · Libby · Polson · Alberton · Ronan · St. Ignatius