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Insulation in Grass Valley: July highs average about 86°F; January lows average about 28°F.
In Sherman County, July highs average about 86°F and January lows about 28°F, with roughly 13 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 and hailstorms in Sherman County, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Sherman County has had 7 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storms, Straight-Line Winds, Landslides, And Mudslides (2024).
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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 Sherman County figures — more about homes in Wasco.
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