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Decks in Diamond Bar: July highs average about 89°F; about 15 inches of rain fall a year.
In Los Angeles County, July highs average about 89°F and January lows about 41°F, with roughly 15 inches of rain a year.
Over the last 10 years the National Weather Service recorded flash floods, damaging thunderstorm winds and floods in Los Angeles County, with hail up to 1 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Los Angeles County was built around 1958, about 68 years ago, and 74% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
Los Angeles County has had 67 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Canyon Fire (2025).
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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.
These are Los Angeles County figures — more about homes in Los Angeles.
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