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Insulation in Centennial: July highs average about 89°F; January lows average about 16°F.
In Arapahoe County, July highs average about 89°F and January lows about 16°F, with roughly 16 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 tornadoes in Arapahoe 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.
Arapahoe County has had 9 federal disaster declarations in the last 25 years, most often for floods; the latest was Severe Storms, Flooding, And Tornadoes (2023).
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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 Arapahoe County figures — more about homes in Aurora.
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