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Decks in Seneca: July highs average about 84°F; about 37 inches of rain fall a year.
In LaSalle County, July highs average about 84°F and January lows about 15°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 tornadoes in LaSalle 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.
LaSalle County has had 10 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Covid-19 Pandemic (2020).
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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 LaSalle County figures — more about homes in Ottawa.
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