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Insulation in Spokane: July highs average about 84°F; January lows average about 24°F.
In Spokane County, July highs average about 84°F and January lows about 24°F, with roughly 20 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, floods and hailstorms in Spokane 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.
Spokane County has had 23 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Wildfires (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.
Airway Heights · Millwood · Spokane Valley · Medical Lake · Cheney · Liberty Lake · Spangle · Rockford