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Insulation in Grandview: July highs average about 81°F; January lows average about 24°F.
In Yakima County, July highs average about 81°F and January lows about 24°F, with roughly 26 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 and damaging thunderstorm winds in Yakima County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Yakima County has had 25 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 Yakima County figures — more about homes in Yakima.
Mabton · Sunnyside · Prosser · Granger · Benton City · Zillah · Toppenish · West Richland