Vernonburg, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.6 °C (low) to 25 °C (high). Annual precipitation averages 1340.9 Millimeters. Vernonburg is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 16.1 °C | 89.41 mm |
| February | 5.5 °C | 17.9 °C | 85.85 mm |
| March | 8.9 °C | 21.3 °C | 93.98 mm |
| April | 12.7 °C | 25.1 °C | 76.71 mm |
| May | 17.2 °C | 28.7 °C | 89.66 mm |
| June | 21.2 °C | 31.6 °C | 157.73 mm |
| July | 22.8 °C | 33.1 °C | 154.43 mm |
| August | 22.6 °C | 32.3 °C | 200.41 mm |
| September | 20.3 °C | 29.9 °C | 125.48 mm |
| October | 14.6 °C | 25.8 °C | 111.51 mm |
| November | 8.6 °C | 21 °C | 64.01 mm |
| December | 5.4 °C | 17.4 °C | 91.69 mm |
| Annual | 13.6 °C | 25 °C | 1340.87 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |