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Insulation in Denison: July highs average about 89°F; January lows average about 17°F.
In Jackson County, July highs average about 89°F and January lows about 17°F, with roughly 36 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 Jackson 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.
Jackson 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, Tornadoes, And Flooding (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 Jackson County figures — more about homes in Holton.
Mayetta · Holton · Valley Falls · Hoyt · Muscotah · Whiting · Ozawkie · Meriden