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Gutters in Sumas carry about 72 inches of rain a year — clogged or loose gutters push water into fascia, siding and foundations.
In Whatcom County, July highs average about 70°F and January lows about 27°F, with roughly 72 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 Whatcom County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Whatcom County has had 15 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Storms, Straight-Line Winds, Flooding, Landslides, And Mudslides (2026).
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Twice a year for most homes — late spring and after the leaves fall — and after big storms.
Under heavy trees, yes; they cut cleanings but still need a yearly check.
Sagging runs, water spilling over the edge, peeling paint or stains on the fascia, and puddles at the foundation.
These are Whatcom County figures — more about homes in Bellingham.
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