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Decks in Little Sioux: July highs average about 85°F; about 33 inches of rain fall a year.
In Harrison County, July highs average about 85°F and January lows about 12°F, with roughly 33 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 tornadoes in Harrison County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Harrison County has had 14 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (2025).
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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 Harrison County figures — more about homes in Missouri Valley.
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