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Decks in Johnson City: July highs average about 86°F; about 46 inches of rain fall a year.
In Washington 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, flash floods and hailstorms in Washington 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 Washington County was built around 1985, about 41 years ago, and 46% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Washington County has had 11 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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