Cumming, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.1 °F (low) to 70.7 °F (high). Annual precipitation averages 57.6 Inches. Cumming is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.8 °F | 50.8 °F | 5.38 in. |
| February | 33.4 °F | 54.9 °F | 5.16 in. |
| March | 39.5 °F | 62.9 °F | 5.39 in. |
| April | 47.2 °F | 71.5 °F | 4.61 in. |
| May | 56.1 °F | 78.5 °F | 4.14 in. |
| June | 64.3 °F | 84.7 °F | 4.72 in. |
| July | 67.9 °F | 87.6 °F | 5.37 in. |
| August | 67.1 °F | 87.3 °F | 4.99 in. |
| September | 60.9 °F | 82.0 °F | 4.27 in. |
| October | 49.5 °F | 72.4 °F | 3.97 in. |
| November | 38.9 °F | 62.0 °F | 4.48 in. |
| December | 33.8 °F | 53.4 °F | 5.07 in. |
| Annual | 49.1 °F | 70.7 °F | 57.55 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |