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Insulation in Casselton: July highs average about 82°F; January lows average about -0°F.
In Cass County, July highs average about 82°F and January lows about -0°F, with roughly 23 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 Cass 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.
Cass County has had 18 federal disaster declarations in the last 25 years, most often for floods; 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.
These are Cass County figures — more about homes in Fargo.
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