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Insulation in Thompson: July highs average about 81°F; January lows average about -2°F.
In Grand Forks County, July highs average about 81°F and January lows about -2°F, with roughly 22 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 Grand Forks County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Grand Forks County has had 21 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, And Tornadoes (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 Grand Forks County figures — more about homes in Grand Forks.
Reynolds · Grand Forks · Buxton · Emerado · Hatton · Manvel · Northwood · Mayville