Fort Jesup, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.2 °F (low) to 77.3 °F (high). Annual precipitation averages 55.7 Inches. Fort Jesup is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.5 °F | 58.8 °F | 5.61 in. |
| February | 40.8 °F | 63.2 °F | 4.65 in. |
| March | 47.5 °F | 70.5 °F | 5.17 in. |
| April | 54.6 °F | 77.2 °F | 4.94 in. |
| May | 62.9 °F | 84.2 °F | 4.5 in. |
| June | 69.9 °F | 90.2 °F | 4.61 in. |
| July | 72.3 °F | 92.7 °F | 3.87 in. |
| August | 71.5 °F | 93.4 °F | 3.92 in. |
| September | 65.8 °F | 88.4 °F | 3.51 in. |
| October | 54.9 °F | 79.3 °F | 4.46 in. |
| November | 45.1 °F | 68.7 °F | 4.81 in. |
| December | 39.4 °F | 60.7 °F | 5.63 in. |
| Annual | 55.2 °F | 77.3 °F | 55.68 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |