Jean Lafitte, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.9 °C (low) to 25.8 °C (high). Annual precipitation averages 1664.5 Millimeters. Jean Lafitte is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °C | 17 °C | 142.49 mm |
| February | 8.7 °C | 19.1 °C | 103.89 mm |
| March | 11.9 °C | 22.4 °C | 119.38 mm |
| April | 15.5 °C | 25.7 °C | 126.75 mm |
| May | 19.7 °C | 29.5 °C | 138.43 mm |
| June | 22.9 °C | 32.1 °C | 178.31 mm |
| July | 23.8 °C | 32.9 °C | 195.83 mm |
| August | 23.8 °C | 32.8 °C | 184.4 mm |
| September | 22 °C | 30.9 °C | 153.67 mm |
| October | 16.8 °C | 26.9 °C | 91.69 mm |
| November | 11.1 °C | 21.7 °C | 99.57 mm |
| December | 8.1 °C | 18.3 °C | 130.05 mm |
| Annual | 15.9 °C | 25.8 °C | 1664.46 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |