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Insulation in St. John: July highs average about 86°F; January lows average about 26°F.
In Whitman County, July highs average about 86°F and January lows about 26°F, with roughly 18 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 hailstorms in Whitman County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Whitman County has had 8 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Wildfires (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 Whitman County figures — more about homes in Pullman.
Malden · Endicott · Rosalia · Oakesdale · Lamont · Colfax · Garfield · Sprague