30-year climate normals

Jefferson County Climate and Weather Averages

Hottest month — July

91.2°

average daily high. The coldest month is January, averaging a low of 34.0°F.

Jefferson County gets 47.57" of precipitation a year, and 30% 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	57.1°	34.0°	4.36"
February	60.9°	36.8°	4.11"
March	68.1°	42.7°	4.35"
April	75.8°	50.1°	3.20"
May	83.0°	59.2°	3.36"
June	88.5°	67.3°	4.57"
July	91.2°	70.4°	4.66"
August	89.6°	69.7°	4.93"
September	84.9°	63.9°	4.03"
October	76.4°	52.0°	2.58"
November	66.5°	41.7°	3.02"
December	58.8°	36.4°	4.40"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 30% falling in the wettest three months (Jun, Jul, Aug).

January 4.36"

February 4.11"

March 4.35"

April 3.20"

May 3.36"

June 4.57"

July 4.66"

August 4.93"

September 4.03"

October 2.58"

November 3.02"

December 4.40"

Annual total 47.57"

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 2,007

Heating degree days How much heating the climate demands 2,510

Approximate annual cooling cost At 15.84¢/kWh, Georgia average $318

Approximate annual electric heating cost Lower where heating is gas rather than electric $139

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 91.2°F in July and a low of 34.0°F in January. Annual precipitation is 47.57 inches, with essentially no snow.

When is the rainy season in Jefferson County?

The wettest stretch is Jun, Jul, Aug, which accounts for 30% 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 July, the hottest month, is 91.2°F. That drives 2,007 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 LOUISVILLE 1 E, GA US (USC00095314), 3.6 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, Georgia residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.