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Insulation in Leonville: July highs average about 92°F; January lows average about 41°F.
In St. Landry Parish, July highs average about 92°F and January lows about 41°F, with roughly 61 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 damaging thunderstorm winds, tornadoes and flash floods in St. Landry Parish, with hail up to 1.25 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
St. Landry Parish has had 37 federal disaster declarations in the last 25 years, most often for hurricanes; the latest was Tropical Storm Arthur (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 St. Landry Parish figures — more about homes in Opelousas.
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