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Insulation in Twisp: July highs average about 77°F; January lows average about 19°F.
In Okanogan County, July highs average about 77°F and January lows about 19°F, with roughly 23 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, damaging thunderstorm winds and flash floods in Okanogan 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.
Okanogan County has had 34 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.
These are Okanogan County figures — more about homes in Omak.
Winthrop · Conconully · Pateros · Brewster · Okanogan · Omak · Riverside · Bridgeport