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Insulation in Williamstown: July highs average about 84°F; January lows average about 21°F.
In Dauphin County, July highs average about 84°F and January lows about 21°F, with roughly 46 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Dauphin County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Dauphin County has had 14 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 Dauphin County figures — more about homes in Harrisburg.
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