Atlanta, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.3 °C (high). Annual precipitation averages 1055.6 Millimeters. Atlanta is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.4 °C | 1.3 °C | 69.09 mm |
| February | -5.9 °C | 3.5 °C | 56.9 mm |
| March | -1.2 °C | 9.6 °C | 79.25 mm |
| April | 4.6 °C | 16.7 °C | 103.63 mm |
| May | 10.9 °C | 22.6 °C | 114.05 mm |
| June | 15.9 °C | 27.3 °C | 127.25 mm |
| July | 17.4 °C | 28.8 °C | 110.49 mm |
| August | 16.3 °C | 28.2 °C | 83.06 mm |
| September | 12.2 °C | 25.3 °C | 80.77 mm |
| October | 6.1 °C | 18.4 °C | 78.23 mm |
| November | 0.4 °C | 10.5 °C | 82.55 mm |
| December | -4.4 °C | 3.9 °C | 70.36 mm |
| Annual | 5.4 °C | 16.3 °C | 1055.63 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |