Shellman, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 24.7 °C (high). Annual precipitation averages 1330.4 Millimeters. Shellman is located in USDA Plant Hardiness Zone 8b. 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 | 2.6 °C | 15 °C | 123.95 mm |
| February | 4.2 °C | 17.1 °C | 118.62 mm |
| March | 7.3 °C | 21.1 °C | 127 mm |
| April | 11.2 °C | 24.8 °C | 106.68 mm |
| May | 16.3 °C | 29.1 °C | 76.45 mm |
| June | 20.2 °C | 31.8 °C | 125.48 mm |
| July | 21.6 °C | 32.8 °C | 143.76 mm |
| August | 21.3 °C | 32.4 °C | 118.36 mm |
| September | 18.7 °C | 30.2 °C | 98.04 mm |
| October | 12.7 °C | 25.8 °C | 69.09 mm |
| November | 6.8 °C | 20.3 °C | 89.66 mm |
| December | 4 °C | 16.2 °C | 133.35 mm |
| Annual | 12.2 °C | 24.7 °C | 1330.44 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°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 |