30-year climate normals

Marion County Climate and Weather Averages

Hottest month — August

91.8°

average daily high. The coldest month is January, averaging a low of 37.6°F.

Marion County gets 61.88" of precipitation a year, and 29% 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	59.9°	37.6°	6.52"
February	64.1°	41.5°	5.21"
March	71.3°	47.9°	5.72"
April	77.5°	54.6°	5.22"
May	84.6°	63.2°	4.35"
June	90.0°	70.2°	5.77"
July	91.6°	72.4°	6.05"
August	91.8°	72.0°	6.04"
September	88.1°	67.2°	3.60"
October	79.7°	55.6°	3.75"
November	69.1°	44.7°	3.86"
December	61.9°	40.0°	5.79"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Jun, Jul, Aug).

January 6.52"

February 5.21"

March 5.72"

April 5.22"

May 4.35"

June 5.77"

July 6.05"

August 6.04"

September 3.60"

October 3.75"

November 3.86"

December 5.79"

Annual total 61.88"

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 2,535

Heating degree days How much heating the climate demands 1,953

Approximate annual cooling cost At 16.16¢/kWh, Mississippi average $410

Approximate annual electric heating cost Lower where heating is gas rather than electric $110

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 Marion County, where electricity is one line of eight.

Common questions

What is the weather like in Marion County?

Marion County averages a high of 91.8°F in August and a low of 37.6°F in January. Annual precipitation is 61.88 inches, with essentially no snow.

When is the rainy season in Marion County?

The wettest stretch is Jun, Jul, Aug, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Marion County?

The average daily high in August, the hottest month, is 91.8°F. That drives 2,535 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Marion County?

Effectively no. Measurable snowfall is rare in Marion County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station COLUMBIA, MS US (USC00221865), 1.5 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.