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Insulation in Mill Valley: July highs average about 72°F; January lows average about 43°F.
In Marin County, July highs average about 72°F and January lows about 43°F, with roughly 36 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods, hailstorms and damaging thunderstorm winds in Marin 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.
Marin County has had 12 federal disaster declarations in the last 25 years, most often for severe storms; 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 Marin County figures — more about homes in San Rafael.
Larkspur · Corte Madera · Ross · Sausalito · Belvedere · Tiburon · San Anselmo · San Rafael