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Insulation in Dandridge: July highs average about 88°F; January lows average about 28°F; the typical home was built around 1994 (34% before 1980).
In Jefferson County, July highs average about 88°F and January lows about 28°F, with roughly 49 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Jefferson County, with hail up to 1.5 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
The typical home in Jefferson County was built around 1994, about 32 years ago, and 34% were built before 1980.
Jefferson County has had 14 federal disaster declarations in the last 25 years, most often for severe storms; the latest was Severe Winter Storm (2026).
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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 Jefferson County figures — more about homes in Jefferson City.
Jefferson City · New Market · Baneberry · White Pine · Sevierville · Newport · Morristown · Blaine