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Generators in Vienna: Fairfax County has seen damaging thunderstorm winds and floods in the last 10 years, with hail up to 1.75 inches.
In Fairfax County, July highs average about 88°F and January lows about 26°F, with roughly 43 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, floods and flash floods in Fairfax 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.
Fairfax 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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Enough for the fridge, heating or cooling, lights and medical equipment; the pro sizes it from what you want running.
A standby generator starts on its own in an outage; portable is cheaper but has to be wheeled out and fuelled.
These are Fairfax County figures — more about homes in Herndon.
Fairfax · Falls Church · Herndon · Clifton · Alexandria · Manassas Park · Occoquan · Manassas