Port Vincent, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.7 °F (low) to 78.5 °F (high). Annual precipitation averages 65.7 Inches. 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 | 41.3 °F | 62.0 °F | 5.96 in. |
| February | 44.6 °F | 66.0 °F | 4.82 in. |
| March | 50.7 °F | 72.6 °F | 4.68 in. |
| April | 56.5 °F | 78.5 °F | 5.24 in. |
| May | 64.7 °F | 85.1 °F | 5.93 in. |
| June | 71.0 °F | 89.8 °F | 7.03 in. |
| July | 73.2 °F | 91.4 °F | 6.24 in. |
| August | 72.7 °F | 91.9 °F | 6.91 in. |
| September | 68.7 °F | 88.5 °F | 4.89 in. |
| October | 58.0 °F | 81.1 °F | 4.55 in. |
| November | 48.0 °F | 71.0 °F | 4.15 in. |
| December | 43.1 °F | 64.3 °F | 5.26 in. |
| Annual | 57.7 °F | 78.5 °F | 65.66 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |