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Insulation in State Line: July highs average about 80°F; January lows average about 25°F.
In Kootenai County, July highs average about 80°F and January lows about 25°F, with roughly 33 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 Kootenai 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.
Kootenai County has had 11 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, Flooding, Landslides, And Mudslides (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 Kootenai County figures — more about homes in Coeur d'Alene.
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