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Insulation in Chehalis: July highs average about 75°F; January lows average about 31°F.
In Lewis County, July highs average about 75°F and January lows about 31°F, with roughly 73 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 in Lewis County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Lewis County has had 21 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, Flooding, Landslides, And Mudslides (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 Lewis County figures — more about homes in Centralia.
Centralia · Napavine · Bucoda · Winlock · Tenino · Toledo · Pe Ell · Oakville