Atlanta, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 61.4 °F (high). Annual precipitation averages 41.6 Inches. 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 | 18.7 °F | 34.3 °F | 2.72 in. |
| February | 21.3 °F | 38.3 °F | 2.24 in. |
| March | 29.9 °F | 49.2 °F | 3.12 in. |
| April | 40.2 °F | 62.0 °F | 4.08 in. |
| May | 51.6 °F | 72.7 °F | 4.49 in. |
| June | 60.7 °F | 81.1 °F | 5.01 in. |
| July | 63.4 °F | 83.9 °F | 4.35 in. |
| August | 61.4 °F | 82.7 °F | 3.27 in. |
| September | 53.9 °F | 77.5 °F | 3.18 in. |
| October | 43.0 °F | 65.2 °F | 3.08 in. |
| November | 32.8 °F | 50.9 °F | 3.25 in. |
| December | 24.1 °F | 39.0 °F | 2.77 in. |
| Annual | 41.8 °F | 61.4 °F | 41.56 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |