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United States › Louisiana › Jefferson Parish › Climate Station NEW ORLEANS ALVIN CALLENDER FL, LA US Distance 21.7 mi Normals 1991–2020

30-year climate normals

Jefferson Parish Climate and Weather Averages

Hottest month — July

89.9°

average daily high. The coldest month is January, averaging a low of 43.0°F.

Jefferson Parish gets 63.8" of precipitation a year, and 33% 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.

60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 62.4° 43.0° 5.07"
February 66.3° 46.2° 3.93"
March 71.4° 51.8° 4.60"
April 77.3° 57.6° 5.18"
May 83.8° 65.3° 5.36"
June 88.5° 71.2° 6.86"
July 89.9° 72.5° 8.05"
August 89.9° 73.3° 6.08"
September 86.8° 70.3° 6.75"
October 79.8° 60.4° 3.60"
November 70.6° 49.4° 3.86"
December 64.1° 44.9° 4.46"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 33% falling in the wettest three months (Jun, Jul, Aug).

January 5.07"
February 3.93"
March 4.60"
April 5.18"
May 5.36"
June 6.86"
July 8.05"
August 6.08"
September 6.75"
October 3.60"
November 3.86"
December 4.46"
Annual total 63.8"

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 2,615
Heating degree days How much heating the climate demands 1,426
Approximate annual cooling cost At 14.15¢/kWh, Louisiana average $370
Approximate annual electric heating cost Lower where heating is gas rather than electric $71

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 Jefferson Parish, where electricity is one line of eight.

Common questions

What is the weather like in Jefferson Parish?

Jefferson Parish averages a high of 89.9°F in July and a low of 43.0°F in January. Annual precipitation is 63.8 inches, with essentially no snow.

When is the rainy season in Jefferson Parish?

The wettest stretch is Jun, Jul, Aug, which accounts for 33% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Jefferson Parish?

The average daily high in July, the hottest month, is 89.9°F. That drives 2,615 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Jefferson Parish?

Effectively no. Measurable snowfall is rare in Jefferson Parish.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station NEW ORLEANS ALVIN CALLENDER FL, LA US (USW00012958), 21.7 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.