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Insulation in Roslyn Harbor: July highs average about 85°F; January lows average about 26°F.
In Nassau County, July highs average about 85°F and January lows about 26°F, with roughly 46 inches of rain a year.
Over the last 10 years the National Weather Service recorded flash floods, damaging thunderstorm winds and hailstorms in Nassau County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Nassau County has had 18 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Storm And Flooding (2024).
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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 Nassau County figures — more about homes in Hempstead.
Roslyn · East Hills · Roslyn Estates · Flower Hill · Munsey Park · Sea Cliff · Old Brookville · Old Westbury