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Decks in Mercer: July highs average about 82°F; about 18 inches of rain fall a year.
In McLean County, July highs average about 82°F and January lows about 2°F, with roughly 18 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 McLean 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.
McLean County has had 13 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, And Tornadoes (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 McLean County figures — more about homes in Garrison.
Turtle Lake · McClusky · Washburn · Underwood · Wilton · Butte · Coleharbor · Regan