30-year climate normals

Assumption Parish Climate and Weather Averages

Hottest month — August

90.8°

average daily high. The coldest month is January, averaging a low of 41.7°F.

Assumption Parish gets 63.4" of precipitation a year, and 31% 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	62.1°	41.7°	5.78"
February	66.1°	45.2°	4.11"
March	72.4°	51.0°	4.03"
April	78.4°	57.1°	4.88"
May	84.9°	65.1°	5.64"
June	89.2°	71.6°	6.97"
July	90.6°	73.5°	6.51"
August	90.8°	73.1°	6.37"
September	87.6°	69.1°	5.39"
October	80.3°	58.6°	4.65"
November	70.9°	48.6°	4.21"
December	64.4°	43.7°	4.86"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 31% falling in the wettest three months (Jun, Jul, Aug).

January 5.78"

February 4.11"

March 4.03"

April 4.88"

May 5.64"

June 6.97"

July 6.51"

August 6.37"

September 5.39"

October 4.65"

November 4.21"

December 4.86"

Annual total 63.4"

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 2,705

Heating degree days How much heating the climate demands 1,525

Approximate annual cooling cost At 14.15¢/kWh, Louisiana average $383

Approximate annual electric heating cost Lower where heating is gas rather than electric $76

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 Assumption Parish, where electricity is one line of eight.

Common questions

What is the weather like in Assumption Parish?

Assumption Parish averages a high of 90.8°F in August and a low of 41.7°F in January. Annual precipitation is 63.4 inches, with essentially no snow.

When is the rainy season in Assumption Parish?

The wettest stretch is Jun, Jul, Aug, which accounts for 31% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Assumption Parish?

The average daily high in August, the hottest month, is 90.8°F. That drives 2,705 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Assumption Parish?

Effectively no. Measurable snowfall is rare in Assumption Parish.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station DONALDSONVILLE 4 SW, LA US (USC00162534), 11.9 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.