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Insulation in Chinook: July highs average about 83°F; January lows average about 8°F.
In Blaine County, July highs average about 83°F and January lows about 8°F, with roughly 14 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 Blaine County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Blaine County has had 10 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.
Havre · Harlem · Dodson · Big Sandy · Hingham · Malta · Winifred · Chester