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Decks in Roslyn: July highs average about 81°F; about 24 inches of rain fall a year.
In Day County, July highs average about 81°F and January lows about 2°F, with roughly 24 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 Day County, with hail up to 2.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Day County has had 16 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, 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.
These are Day County figures — more about homes in Webster.
Grenville · Eden · Webster · Waubay · Bristol · Lake City · Pierpont · Ortley