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United States › Georgia › Chatham County › Climate Station SAVANNAH INTL AP, GA US Distance 12.7 mi Normals 1991–2020

30-year climate normals

Chatham County Climate and Weather Averages

Hottest month — July

92.3°

average daily high. The coldest month is January, averaging a low of 40.0°F.

Chatham County gets 48.12" of precipitation a year, and 37% 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.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 61.4° 40.0° 3.28"
February 65.1° 42.9° 2.80"
March 71.4° 48.6° 3.50"
April 78.2° 55.2° 3.39"
May 84.7° 63.4° 3.62"
June 89.6° 70.7° 6.65"
July 92.3° 73.7° 5.75"
August 90.8° 73.3° 5.46"
September 86.4° 69.0° 4.35"
October 79.0° 58.6° 3.72"
November 70.2° 48.0° 2.39"
December 63.7° 42.6° 3.21"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 37% falling in the wettest three months (Jun, Jul, Aug).

January 3.28"
February 2.80"
March 3.50"
April 3.39"
May 3.62"
June 6.65"
July 5.75"
August 5.46"
September 4.35"
October 3.72"
November 2.39"
December 3.21"
Annual total 48.12"

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 2,596
Heating degree days How much heating the climate demands 1,675
Approximate annual cooling cost At 15.84¢/kWh, Georgia average $411
Approximate annual electric heating cost Lower where heating is gas rather than electric $93

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 Chatham County, where electricity is one line of eight.

Common questions

What is the weather like in Chatham County?

Chatham County averages a high of 92.3°F in July and a low of 40.0°F in January. Annual precipitation is 48.12 inches, with essentially no snow.

When is the rainy season in Chatham County?

The wettest stretch is Jun, Jul, Aug, which accounts for 37% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Chatham County?

The average daily high in July, the hottest month, is 92.3°F. That drives 2,596 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Chatham County?

Effectively no. Measurable snowfall is rare in Chatham County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SAVANNAH INTL AP, GA US (USW00003822), 12.7 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, Georgia residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.