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Decks in Janesville: July highs average about 83°F; about 37 inches of rain fall a year.
In Rock County, July highs average about 83°F and January lows about 12°F, with roughly 37 inches of rain a year. Long, cold winters put furnaces and pipes to the test.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and floods in Rock County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Rock County has had 8 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Tornadoes, And Flooding (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.
Milton · Footville · Edgerton · Beloit · Clinton · Orfordville · Evansville · Darien