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Insulation in Fortuna: July highs average about 80°F; January lows average about -0°F.
In Divide County, July highs average about 80°F and January lows about -0°F, with roughly 16 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 Divide County, with hail up to 3 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Divide County has had 9 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 Divide County figures — more about homes in Crosby.
Ambrose · Grenora · Crosby · Alamo · Wildrose · Noonan · Columbus · Epping