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Insulation in Mandan: July highs average about 83°F; January lows average about 3°F.
In Morton County, July highs average about 83°F and January lows about 3°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 hailstorms, damaging thunderstorm winds and tornadoes in Morton County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Morton County has had 13 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storm, Tornadoes, And Straight-Line Winds (2025).
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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.
Bismarck · Lincoln · Wilton · New Salem · Center · Regan · Almont · Flasher