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Insulation in Blanco: July highs average about 94°F; January lows average about 38°F.
In Blanco County, July highs average about 94°F and January lows about 38°F, with roughly 33 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, flash floods and damaging thunderstorm winds in Blanco County, with hail up to 6.12 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
Blanco County has had 15 federal disaster declarations in the last 25 years, most often for wildfires; the latest was Flooding (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 Blanco County figures — more about homes in Johnson City.
Johnson City · Spring Branch · Woodcreek · Dripping Springs · Round Mountain · Wimberley · Bulverde · Fair Oaks Ranch