30-year climate normals

Washington County Climate and Weather Averages

Hottest month — July

92.5°

average daily high. The coldest month is January, averaging a low of 35.1°F.

Washington County gets 49" of precipitation a year, and 29% of it falls in Feb, Mar, Apr.

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	53.0°	35.1°	4.49"
February	57.9°	37.9°	4.72"
March	66.0°	45.2°	4.71"
April	74.5°	53.5°	5.01"
May	82.7°	62.4°	3.79"
June	89.4°	69.3°	3.32"
July	92.5°	72.4°	3.18"
August	92.3°	70.9°	2.83"
September	88.0°	64.0°	3.62"
October	77.2°	53.0°	4.22"
November	64.7°	42.4°	4.01"
December	55.2°	37.1°	5.10"

Rainfall by month

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

January 4.49"

February 4.72"

March 4.71"

April 5.01"

May 3.79"

June 3.32"

July 3.18"

August 2.83"

September 3.62"

October 4.22"

November 4.01"

December 5.10"

Annual total 49"

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 2,295

Heating degree days How much heating the climate demands 2,619

Approximate annual cooling cost At 16.16¢/kWh, Mississippi average $371

Approximate annual electric heating cost Lower where heating is gas rather than electric $148

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 Washington County, where electricity is one line of eight.

Common questions

What is the weather like in Washington County?

Washington County averages a high of 92.5°F in July and a low of 35.1°F in January. Annual precipitation is 49 inches, with essentially no snow.

When is the rainy season in Washington County?

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

How hot does it get in Washington County?

The average daily high in July, the hottest month, is 92.5°F. That drives 2,295 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Washington County?

Effectively no. Measurable snowfall is rare in Washington County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station GREENVILLE ASOS, MS US (USW00013939), 14.7 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, Mississippi residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.