Port Vincent, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.3 °C (low) to 25.9 °C (high). Annual precipitation averages 1667.8 Millimeters. Port Vincent is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.2 °C | 16.7 °C | 151.38 mm |
| February | 7 °C | 18.9 °C | 122.43 mm |
| March | 10.4 °C | 22.6 °C | 118.87 mm |
| April | 13.6 °C | 25.8 °C | 133.1 mm |
| May | 18.2 °C | 29.5 °C | 150.62 mm |
| June | 21.7 °C | 32.1 °C | 178.56 mm |
| July | 22.9 °C | 33 °C | 158.5 mm |
| August | 22.6 °C | 33.3 °C | 175.51 mm |
| September | 20.4 °C | 31.4 °C | 124.21 mm |
| October | 14.4 °C | 27.3 °C | 115.57 mm |
| November | 8.9 °C | 21.7 °C | 105.41 mm |
| December | 6.2 °C | 17.9 °C | 133.6 mm |
| Annual | 14.3 °C | 25.9 °C | 1667.76 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |