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United States › Mississippi › Jefferson County › Climate Station PORT GIBSON 1 NE, MS US Distance 17.9 mi Normals 1991–2020

30-year climate normals

Jefferson County Climate and Weather Averages

Hottest month — August

93.4°

average daily high. The coldest month is January, averaging a low of 35.7°F.

Jefferson County gets 56.26" of precipitation a year, and 31% of it falls in Jan, Feb, Mar.

Temperature through the year

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

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 59.5° 35.7° 6.10"
February 63.7° 38.1° 5.06"
March 71.0° 45.9° 6.01"
April 77.9° 52.5° 5.45"
May 84.9° 61.5° 4.47"
June 90.5° 69.1° 4.05"
July 92.9° 71.8° 3.94"
August 93.4° 70.9° 3.56"
September 89.1° 65.3° 3.75"
October 80.1° 53.1° 4.11"
November 69.1° 42.7° 4.44"
December 61.5° 38.1° 5.32"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 31% falling in the wettest three months (Jan, Feb, Mar).

January 6.10"
February 5.06"
March 6.01"
April 5.45"
May 4.47"
June 4.05"
July 3.94"
August 3.56"
September 3.75"
October 4.11"
November 4.44"
December 5.32"
Annual total 56.26"

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 2,471
Heating degree days How much heating the climate demands 2,163
Approximate annual cooling cost At 16.16¢/kWh, Mississippi average $399
Approximate annual electric heating cost Lower where heating is gas rather than electric $122

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 County, where electricity is one line of eight.

Common questions

What is the weather like in Jefferson County?

Jefferson County averages a high of 93.4°F in August and a low of 35.7°F in January. Annual precipitation is 56.26 inches, with essentially no snow.

When is the rainy season in Jefferson County?

The wettest stretch is Jan, Feb, Mar, which accounts for 31% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Jefferson County?

The average daily high in August, the hottest month, is 93.4°F. That drives 2,471 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Jefferson County?

Effectively no. Measurable snowfall is rare in Jefferson County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PORT GIBSON 1 NE, MS US (USC00227132), 17.9 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, Mississippi residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.