Climate 

The highest temperature recorded in Georgia is 112°, Fahrenheit. This record high was recorded on July 24, 1953 at Louisville.The lowest temperature in Georgia, -17°, was recorded on January 27, 1940 at CCC Camp.Monthly average temperatures range from a high of 92.2 degrees to a low of 32.6 degrees.A humid subtropical climate with mild winters and hot moist summers is characteristic of most of Georgia. The average annual precipitation varies from about 40" in central Georgia to more than 75" in northeast Georgia. One of two annual precipitation maxima occurs in February or March, when between 4" and 6" of rain may be expected because of the high seasonal incidence of cyclonic activity over the southeastern United States. The second maximum occurs in June and July, when precipitation from thunderstorm activity may bring 4" to 7" monthly.
The number of summer days when the temperature exceeds 90 degrees F are numerous, but in the mountain areas and the hilly Piedmont cool evenings bring welcome relief. Winters are mild, but significant variation occurs from south to north in Georgia. Snow cover lasting more than one or two days or exceeding 2" occurs only in the mountainous fringe of north Georgia. The great day-to-day variability in winter weather is caused by the interaction of polar and subtropical air masses. Atlanta's extreme low temperatures are rarely below 14 degrees F.

Due to this information you could choose the most available season for visiting Georgia! I add the link where you have a possibility to read more information about climate: http://www.climate-zone.com/climate/united-states/georgia/atlanta/