Port Wentworth, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.5 °F (low) to 77.4 °F (high). Annual precipitation averages 51.7 Inches. Port Wentworth is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.9 °F | 61.3 °F | 3.65 in. |
| February | 41.8 °F | 64.7 °F | 3.39 in. |
| March | 47.9 °F | 71.0 °F | 3.61 in. |
| April | 54.7 °F | 77.5 °F | 3.41 in. |
| May | 62.9 °F | 84.1 °F | 3.53 in. |
| June | 70.2 °F | 89.2 °F | 6.37 in. |
| July | 73.0 °F | 92.1 °F | 5.86 in. |
| August | 72.7 °F | 90.5 °F | 7.04 in. |
| September | 68.6 °F | 86.1 °F | 4.83 in. |
| October | 58.1 °F | 78.7 °F | 3.75 in. |
| November | 47.2 °F | 70.0 °F | 2.65 in. |
| December | 41.5 °F | 63.6 °F | 3.57 in. |
| Annual | 56.5 °F | 77.4 °F | 51.66 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |