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Decks in Kalispell: July highs average about 76°F; about 36 inches of rain fall a year.
In Flathead County, July highs average about 76°F and January lows about 17°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 hailstorms, damaging thunderstorm winds and floods in Flathead County, with hail up to 2.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Flathead County has had 9 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Severe Winter Storm And Straight-Line Winds (2026).
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Composite costs more up front and needs almost no care; pressure-treated wood is cheaper but needs sealing.
Once a year — loose boards, soft spots and wobbly railings are safety issues.
Columbia Falls · Whitefish · Polson · Hot Springs · Ronan · Eureka · Libby · Plains