Sumner, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.8 °F (low) to 76.6 °F (high). Annual precipitation averages 49.7 Inches. Sumner is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 59.6 °F | 4.59 in. |
| February | 41.6 °F | 63.3 °F | 4.27 in. |
| March | 47.2 °F | 70.1 °F | 4.95 in. |
| April | 54.5 °F | 76.7 °F | 3.59 in. |
| May | 63.0 °F | 84.1 °F | 2.9 in. |
| June | 69.7 °F | 88.6 °F | 5.11 in. |
| July | 72.0 °F | 90.6 °F | 5.01 in. |
| August | 71.5 °F | 89.9 °F | 4.85 in. |
| September | 66.8 °F | 86.3 °F | 4.24 in. |
| October | 56.8 °F | 78.5 °F | 2.99 in. |
| November | 46.3 °F | 69.1 °F | 3.01 in. |
| December | 41.1 °F | 61.9 °F | 4.18 in. |
| Annual | 55.8 °F | 76.6 °F | 49.69 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |