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Insulation in Delaware City: July highs average about 87°F; January lows average about 25°F.
In New Castle County, July highs average about 87°F and January lows about 25°F, with roughly 46 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, flash floods and hailstorms in New Castle 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.
New Castle County has had 13 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Remnants Of Hurricane Ida (2021).
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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 New Castle County figures — more about homes in Wilmington.
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