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Insulation in Millville: July highs average about 88°F; January lows average about 27°F.
In Sussex County, July highs average about 88°F and January lows about 27°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 Sussex County, with hail up to 2.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Sussex County has had 13 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (2026).
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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 Sussex County figures — more about homes in Milford.
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