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Decks in Fairfax: July highs average about 87°F; about 44 inches of rain fall a year.
In Fairfax city, July highs average about 87°F and January lows about 26°F, with roughly 44 inches of rain a year.
Over the last 10 years the National Weather Service recorded floods and damaging thunderstorm winds in Fairfax city. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Fairfax city 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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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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