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Insulation in Mosier: July highs average about 83°F; January lows average about 27°F.
In Wasco County, July highs average about 83°F and January lows about 27°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, hailstorms and flash floods in Wasco County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Wasco County has had 21 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Grasshopper Fire (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 Wasco County figures — more about homes in The Dalles.
Hood River · The Dalles · Dufur · Cascade Locks · Rufus · Wasco · Moro · Grass Valley