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Insulation in Crystal City: July highs average about 89°F; January lows average about 23°F.
In Jefferson County, July highs average about 89°F and January lows about 23°F, with roughly 44 inches of rain a year.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and flash floods in Jefferson 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.
Jefferson County has had 20 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Storms, Straight-Line Winds, Tornadoes, And Wildfires (2025).
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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 Jefferson County figures — more about homes in Arnold.
Festus · Herculaneum · Pevely · Olympian Village · Kimmswick · Hillsboro · De Soto · Arnold