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Decks in Seneca: July highs average about 88°F; about 34 inches of rain fall a year.
In Nemaha County, July highs average about 88°F and January lows about 16°F, with roughly 34 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 flash floods in Nemaha County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Nemaha County has had 11 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 Nemaha County figures — more about homes in Sabetha.
Oneida · Centralia · Bern · Axtell · Corning · Vermillion · Goff · Sabetha