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Insulation in Johnson: July highs average about 87°F; January lows average about 15°F; the typical home was built around 1940 (77% before 1980).
In Nemaha County, July highs average about 87°F and January lows about 15°F, with roughly 34 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 flash floods in Nemaha County, with hail up to 2.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Nemaha County was built around 1940, about 86 years ago, and 77% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Nemaha 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, 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 Nemaha County figures — more about homes in Auburn.
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