30-year climate normals

Cook County Climate and Weather Averages

Hottest month — July

92.1°

average daily high. The coldest month is January, averaging a low of 38.6°F.

Cook County gets 48.41" of precipitation a year, and 36% 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	62.8°	38.6°	3.83"
February	67.0°	42.2°	3.31"
March	72.9°	47.2°	3.73"
April	79.6°	52.8°	3.66"
May	86.4°	60.3°	2.84"
June	90.1°	67.9°	7.08"
July	92.1°	70.1°	5.33"
August	91.5°	71.0°	5.11"
September	87.8°	66.5°	4.22"
October	80.5°	56.8°	3.71"
November	71.4°	46.6°	2.47"
December	65.0°	41.3°	3.12"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 36% falling in the wettest three months (Jun, Jul, Aug).

January 3.83"

February 3.31"

March 3.73"

April 3.66"

May 2.84"

June 7.08"

July 5.33"

August 5.11"

September 4.22"

October 3.71"

November 2.47"

December 3.12"

Annual total 48.41"

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 2,409

Heating degree days How much heating the climate demands 1,649

Approximate annual cooling cost At 15.84¢/kWh, Georgia average $382

Approximate annual electric heating cost Lower where heating is gas rather than electric $91

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 Cook County, where electricity is one line of eight.

Common questions

What is the weather like in Cook County?

Cook County averages a high of 92.1°F in July and a low of 38.6°F in January. Annual precipitation is 48.41 inches, with essentially no snow.

When is the rainy season in Cook County?

The wettest stretch is Jun, Jul, Aug, which accounts for 36% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Cook County?

The average daily high in July, the hottest month, is 92.1°F. That drives 2,409 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Cook County?

Effectively no. Measurable snowfall is rare in Cook County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station VALDOSTA RGNL AP, GA US (USW00093845), 27.1 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.