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In Johnson County, July highs average about 81°F and January lows about 24°F, with roughly 51 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, flash floods and floods in Johnson County. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Johnson County was built around 1978, about 48 years ago, and 53% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Johnson County has had 13 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (2026).
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