Port Wentworth, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.6 °C (low) to 25.2 °C (high). Annual precipitation averages 1312.2 Millimeters. 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 | 3.8 °C | 16.3 °C | 92.71 mm |
| February | 5.4 °C | 18.2 °C | 86.11 mm |
| March | 8.8 °C | 21.7 °C | 91.69 mm |
| April | 12.6 °C | 25.3 °C | 86.61 mm |
| May | 17.2 °C | 28.9 °C | 89.66 mm |
| June | 21.2 °C | 31.8 °C | 161.8 mm |
| July | 22.8 °C | 33.4 °C | 148.84 mm |
| August | 22.6 °C | 32.5 °C | 178.82 mm |
| September | 20.3 °C | 30.1 °C | 122.68 mm |
| October | 14.5 °C | 25.9 °C | 95.25 mm |
| November | 8.4 °C | 21.1 °C | 67.31 mm |
| December | 5.3 °C | 17.6 °C | 90.68 mm |
| Annual | 13.6 °C | 25.2 °C | 1312.16 mm |
| 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 : -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 |