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Insulation in Brentwood: July highs average about 89°F; January lows average about 28°F.
In Williamson County, July highs average about 89°F and January lows about 28°F, with roughly 54 inches of rain a year.
Over the last 10 years the National Weather Service recorded damaging thunderstorm winds, hailstorms and flash floods in Williamson 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.
Williamson County has had 10 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 Williamson County figures — more about homes in Franklin.
Oak Hill · Nolensville · Forest Hills · Franklin · Berry Hill · Belle Meade · La Vergne · Smyrna