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Insulation in Longmont: July highs average about 81°F; January lows average about 17°F.
In Boulder County, July highs average about 81°F and January lows about 17°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 hailstorms, damaging thunderstorm winds and flash floods in Boulder 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.
Boulder County has had 16 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Stone Mountain Fire (2024).
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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 Boulder County figures — more about homes in Boulder.
Mead · Frederick · Firestone · Erie · Lyons · Berthoud · Dacono · Lafayette