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Insulation in Monticello: July highs average about 92°F; January lows average about 21°F; the typical home was built around 1980 (48% before 1980).
In San Juan County, July highs average about 92°F and January lows about 21°F, with roughly 10 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 flash floods, hailstorms and tornadoes in San Juan County, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in San Juan County was built around 1980, about 46 years ago, and 48% were built before 1980. Homes that age often need updated wiring, plumbing and roofs.
San Juan County has had 5 federal disaster declarations in the last 25 years, most often for public-health emergencies; the latest was Deer Creek Fire (2025).
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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 San Juan County figures — more about homes in Blanding.
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