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Insulation in Woodland: July highs average about 76°F; January lows average about 34°F.
In Cowlitz County, July highs average about 76°F and January lows about 34°F, with roughly 78 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, tornadoes and damaging thunderstorm winds in Cowlitz County, with hail up to 0.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Cowlitz County has had 11 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 Cowlitz County figures — more about homes in Longview.
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