Nelson, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.4 °C (high). Annual precipitation averages 1432.3 Millimeters. Nelson 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.8 °C | 10.2 °C | 135.38 mm |
| February | 0.7 °C | 12.5 °C | 126.49 mm |
| March | 4.2 °C | 17.1 °C | 135.64 mm |
| April | 8.3 °C | 21.8 °C | 116.33 mm |
| May | 13.3 °C | 25.7 °C | 104.39 mm |
| June | 17.8 °C | 29.2 °C | 116.08 mm |
| July | 19.8 °C | 30.9 °C | 122.94 mm |
| August | 19.3 °C | 30.6 °C | 116.33 mm |
| September | 15.9 °C | 27.8 °C | 111.51 mm |
| October | 9.4 °C | 22.4 °C | 100.08 mm |
| November | 3.7 °C | 16.4 °C | 114.3 mm |
| December | 1 °C | 11.7 °C | 132.84 mm |
| Annual | 9.4 °C | 21.4 °C | 1432.31 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |