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Insulation in Berwick: July highs average about 90°F; January lows average about 44°F.
In St. Mary Parish, July highs average about 90°F and January lows about 44°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, hailstorms and flash floods in St. Mary Parish, with hail up to 1.75 inches across. After a storm, a quick roof and gutter check catches damage before it turns into a leak.
St. Mary Parish has had 40 federal disaster declarations in the last 25 years, most often for hurricanes; 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 St. Mary Parish figures — more about homes in Morgan City.
Morgan City · Patterson · Franklin · Napoleonville · Baldwin · Thibodaux · Jeanerette · Donaldsonville