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Insulation in Mercer: July highs average about 82°F; January lows average about 2°F.
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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Uneven rooms, high bills and an attic you can see the joists in are the signs; older homes often have far too little.
Attic insulation and air-sealing usually pay back fastest.
These are McLean County figures — more about homes in Garrison.
Turtle Lake · McClusky · Washburn · Underwood · Wilton · Butte · Coleharbor · Regan