Wilmington Island, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.5 °C (low) to 24.3 °C (high). Annual precipitation averages 1312.2 Millimeters. Wilmington Island is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Frost Rare through the first frost around Jan. 21 - Jan. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.7 °C | 15.6 °C | 89.15 mm |
| February | 6.2 °C | 17.2 °C | 84.84 mm |
| March | 9.5 °C | 20.6 °C | 92.2 mm |
| April | 13.7 °C | 24.2 °C | 76.45 mm |
| May | 18.3 °C | 27.9 °C | 86.11 mm |
| June | 21.9 °C | 30.8 °C | 152.91 mm |
| July | 23.4 °C | 32.4 °C | 143.76 mm |
| August | 23.1 °C | 31.6 °C | 193.29 mm |
| September | 21.1 °C | 29.2 °C | 122.43 mm |
| October | 15.8 °C | 25.1 °C | 117.6 mm |
| November | 9.9 °C | 20.4 °C | 66.55 mm |
| December | 6.5 °C | 16.8 °C | 86.87 mm |
| Annual | 14.5 °C | 24.3 °C | 1312.16 mm |
| Average First Frost Date | Jan. 21 - Jan. 31 |
| Average Last Frost Date | Frost Rare |
| Average Days With Frost | Frost Rare |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |