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Insulation in Granger: July highs average about 96°F; January lows average about 38°F.
In Williamson County, July highs average about 96°F and January lows about 38°F, with roughly 36 inches of rain a year. That much heat keeps air conditioners running hard for months, so a yearly tune-up pays off.
Over the last 10 years the National Weather Service recorded hailstorms, damaging thunderstorm winds and flash floods in Williamson County, with hail up to 4 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Williamson County has had 20 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Severe Storms, Straight-Line Winds, And Flooding (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 Williamson County figures — more about homes in Round Rock.
Bartlett · Weir · Taylor · Holland · Jarrell · Thrall · Hutto · Georgetown