Stone Mountain is a city located in DeKalb County, Georgia. It enjoys a humid subtropical climate, characterized by hot, humid summers and mild winters. Summers are typically hot with temperatures averaging in the high 80s to low 90s Fahrenheit, while winters are relatively mild with temperatures ranging from the 30s to 50s Fahrenheit. Spring and fall bring pleasant, mild weather.

Situated near the famous Stone Mountain, the city boasts a diverse hydrology. The iconic Stone Mountain itself, a quartz monzonite dome, is surrounded by a lake called Stone Mountain Lake. This lake offers various opportunities for outdoor recreation, including boating, fishing, and picnicking along its shores.

In addition to the lake, Stone Mountain Park, which encompasses the mountain, provides numerous outdoor activities and attractions for visitors. These include hiking and walking trails, camping, golfing, and a scenic railroad. The park also hosts the famous laser light show and offers opportunities for wildlife viewing.

Overall, Stone Mountain, Georgia offers a pleasant climate, a picturesque lake, and a range of outdoor recreation opportunities making it an attractive destination for nature enthusiasts and outdoor adventurers.