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Insulation in Manassas: July highs average about 88°F; January lows average about 26°F.
In Manassas city, July highs average about 88°F and January lows about 26°F, with roughly 42 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and flash floods in Manassas city, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Manassas city 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.
Manassas Park · Clifton · Haymarket · Fairfax · Occoquan · Dumfries · Vienna · Herndon