Mount Vernon, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.1 °F (low) to 77.6 °F (high). Annual precipitation averages 46.4 Inches. Mount Vernon is located in USDA Plant Hardiness Zone 8b. 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 | 36.7 °F | 60.4 °F | 4.37 in. |
| February | 39.5 °F | 64.1 °F | 3.98 in. |
| March | 45.0 °F | 70.6 °F | 4.29 in. |
| April | 52.2 °F | 77.9 °F | 3.23 in. |
| May | 60.8 °F | 85.3 °F | 2.82 in. |
| June | 68.5 °F | 90.3 °F | 4.79 in. |
| July | 71.5 °F | 92.6 °F | 4.58 in. |
| August | 70.9 °F | 91.6 °F | 5.63 in. |
| September | 65.7 °F | 87.2 °F | 3.38 in. |
| October | 54.6 °F | 79.1 °F | 2.56 in. |
| November | 44.2 °F | 69.6 °F | 2.75 in. |
| December | 39.0 °F | 62.5 °F | 4.06 in. |
| Annual | 54.1 °F | 77.6 °F | 46.44 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |