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Painting in Arnold: July highs average about 89°F; about 44 inches of rain fall a year.
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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Every 7–10 years for most homes; sooner in strong sun or damp.
Dry, mild days — avoid rain, high humidity and extreme heat.
Kimmswick · Green Park · Sunset Hills · Lakeshire · Fenton · Grantwood Village · Crestwood · Bella Villa