McDonough, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.1 °F (low) to 73.5 °F (high). Annual precipitation averages 51.9 Inches. McDonough is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.9 °F | 54.3 °F | 4.77 in. |
| February | 35.6 °F | 58.0 °F | 4.55 in. |
| March | 41.9 °F | 66.1 °F | 5.16 in. |
| April | 49.1 °F | 74.3 °F | 3.96 in. |
| May | 58.4 °F | 82.0 °F | 3.31 in. |
| June | 66.2 °F | 87.7 °F | 4.68 in. |
| July | 69.5 °F | 90.6 °F | 4.94 in. |
| August | 68.8 °F | 89.5 °F | 4.43 in. |
| September | 62.9 °F | 84.2 °F | 3.96 in. |
| October | 51.5 °F | 74.4 °F | 3.37 in. |
| November | 40.6 °F | 64.3 °F | 3.93 in. |
| December | 35.5 °F | 56.4 °F | 4.79 in. |
| Annual | 51.1 °F | 73.5 °F | 51.85 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |