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Insulation in Upper Marlboro: July highs average about 88°F; January lows average about 26°F; the typical home was built around 1969 (62% before 1980).
In Prince George's County, July highs average about 88°F and January lows about 26°F, with roughly 45 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and flash floods in Prince George's 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.
The typical home in Prince George's County was built around 1969, about 57 years ago, and 62% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Prince George's County has had 12 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 Prince George's County figures — more about homes in Bowie.
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