30-year climate normals

LaSalle Parish Climate and Weather Averages

Hottest month — August

91.7°

average daily high. The coldest month is January, averaging a low of 36.2°F.

LaSalle Parish gets 59.51" of precipitation a year, and 29% of it falls in Dec, Jan, Feb.

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	57.1°	36.2°	5.69"
February	61.6°	39.7°	5.53"
March	69.2°	46.6°	5.71"
April	75.6°	53.1°	5.38"
May	82.8°	61.9°	4.43"
June	88.8°	68.8°	4.86"
July	91.3°	71.7°	4.51"
August	91.7°	70.8°	3.80"
September	87.5°	65.3°	3.60"
October	78.1°	53.5°	4.72"
November	67.0°	43.8°	5.46"
December	59.1°	38.4°	5.82"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Dec, Jan, Feb).

January 5.69"

February 5.53"

March 5.71"

April 5.38"

May 4.43"

June 4.86"

July 4.51"

August 3.80"

September 3.60"

October 4.72"

November 5.46"

December 5.82"

Annual total 59.51"

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 2,297

Heating degree days How much heating the climate demands 2,275

Approximate annual cooling cost At 14.15¢/kWh, Louisiana average $325

Approximate annual electric heating cost Lower where heating is gas rather than electric $113

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 LaSalle Parish, where electricity is one line of eight.

Common questions

What is the weather like in LaSalle Parish?

LaSalle Parish averages a high of 91.7°F in August and a low of 36.2°F in January. Annual precipitation is 59.51 inches, with essentially no snow.

When is the rainy season in LaSalle Parish?

The wettest stretch is Dec, Jan, Feb, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in LaSalle Parish?

The average daily high in August, the hottest month, is 91.7°F. That drives 2,297 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in LaSalle Parish?

Effectively no. Measurable snowfall is rare in LaSalle Parish.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station JENA, LA US (USC00164696), 1.9 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.