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Insulation in Cathlamet: July highs average about 72°F; January lows average about 35°F.
In Wahkiakum County, July highs average about 72°F and January lows about 35°F, with roughly 82 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 hailstorms in Wahkiakum 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.
Wahkiakum 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.
Longview · Castle Rock · Kelso · Vader · Pe Ell · Kalama · Winlock · Toledo