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Decks in Mountlake Terrace: July highs average about 71°F; about 85 inches of rain fall a year.
In Snohomish County, July highs average about 71°F and January lows about 31°F, with roughly 85 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 flash floods in Snohomish County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Snohomish County has had 22 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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Composite costs more up front and needs almost no care; pressure-treated wood is cheaper but needs sealing.
Once a year — loose boards, soft spots and wobbly railings are safety issues.
These are Snohomish County figures — more about homes in Everett.
Brier · Lynnwood · Lake Forest Park · Edmonds · Shoreline · Woodway · Kenmore · Bothell