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Gutters in Portola Valley carry about 29 inches of rain a year — clogged or loose gutters push water into fascia, siding and foundations.
In San Mateo County, July highs average about 74°F and January lows about 42°F, with roughly 29 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods, damaging thunderstorm winds and hailstorms in San Mateo 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.
San Mateo County has had 14 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, And Mudslides (2023).
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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 San Mateo County figures — more about homes in San Mateo.
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