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Decks in Hermiston: July highs average about 84°F; about 21 inches of rain fall a year.
In Umatilla County, July highs average about 84°F and January lows about 27°F, with roughly 21 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 Umatilla County, with hail up to 2 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Umatilla County has had 10 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Hagen Fire (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.
Stanfield · Umatilla · Echo · Irrigon · Boardman · Pendleton · Helix · Pilot Rock