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Decks in Kingsport: July highs average about 86°F; about 46 inches of rain fall a year.
In Sullivan County, July highs average about 86°F and January lows about 27°F, with roughly 46 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Sullivan County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Sullivan County was built around 1969, about 57 years ago, and 64% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Sullivan County has had 8 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (2026).
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Composite costs more up front and needs almost no care; pressure-treated wood is cheaper but needs sealing.
Once a year — loose boards, soft spots and wobbly railings are safety issues.
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