30-year climate normals

St. Martin Parish Climate and Weather Averages

Hottest month — August

90.1°

average daily high. The coldest month is January, averaging a low of 42.5°F.

St. Martin Parish gets 66.79" of precipitation a year, and 32% of it falls in Jun, Jul, Aug.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	61.6°	42.5°	5.63"
February	65.4°	46.7°	4.38"
March	71.5°	52.0°	3.93"
April	77.3°	57.3°	5.28"
May	84.1°	65.1°	5.45"
June	88.5°	70.8°	8.06"
July	89.7°	72.8°	6.56"
August	90.1°	72.6°	6.92"
September	86.8°	68.1°	5.85"
October	79.8°	57.9°	5.10"
November	70.4°	48.4°	4.46"
December	63.8°	44.2°	5.17"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (Jun, Jul, Aug).

January 5.63"

February 4.38"

March 3.93"

April 5.28"

May 5.45"

June 8.06"

July 6.56"

August 6.92"

September 5.85"

October 5.10"

November 4.46"

December 5.17"

Annual total 66.79"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 2,558

Heating degree days How much heating the climate demands 1,509

Approximate annual cooling cost At 14.15¢/kWh, Louisiana average $362

Approximate annual electric heating cost Lower where heating is gas rather than electric $75

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in St. Martin Parish, where electricity is one line of eight.

Common questions

What is the weather like in St. Martin Parish?

St. Martin Parish averages a high of 90.1°F in August and a low of 42.5°F in January. Annual precipitation is 66.79 inches, with essentially no snow.

When is the rainy season in St. Martin Parish?

The wettest stretch is Jun, Jul, Aug, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in St. Martin Parish?

The average daily high in August, the hottest month, is 90.1°F. That drives 2,558 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in St. Martin Parish?

Effectively no. Measurable snowfall is rare in St. Martin Parish.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station LAFAYETTE 13 SE, LA US (USW00053960), 15.8 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Louisiana residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.