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Insulation in Johnston: July highs average about 85°F; January lows average about 13°F.
In Polk County, July highs average about 85°F and January lows about 13°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 floods in Polk County, with hail up to 3.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Polk County has had 13 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms 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 Polk County figures — more about homes in Des Moines.
Grimes · Urbandale · Windsor Heights · Polk City · Granger · Clive · Ankeny · Des Moines