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Windows & doors in Harleyville: Dorchester County has seen damaging thunderstorm winds and hailstorms in the last 10 years, with hail up to 2 inches.
In Dorchester County, July highs average about 92°F and January lows about 36°F, with roughly 49 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Dorchester County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Dorchester County has had 22 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Severe Winter Storm (2026).
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Where storms are common, impact-rated windows and doors protect the home and can lower insurance; elsewhere, efficient glass cuts energy bills.
Most last 20–30 years; drafts, fogging between panes and hard-to-open sashes say it is time.
These are Dorchester County figures — more about homes in Summerville.
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