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Insulation in Hillsborough: July highs average about 74°F; January lows average about 42°F.
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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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 San Mateo County figures — more about homes in San Mateo.
Burlingame · San Mateo · Millbrae · Belmont · Foster City · San Bruno · San Carlos · South San Francisco