Melville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.2 °F (low) to 78 °F (high). Annual precipitation averages 59.9 Inches. Melville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.6 °F | 61.4 °F | 6.66 in. |
| February | 44.0 °F | 65.4 °F | 4.88 in. |
| March | 50.2 °F | 72.4 °F | 4.11 in. |
| April | 56.4 °F | 78.2 °F | 5.1 in. |
| May | 64.7 °F | 84.7 °F | 5.23 in. |
| June | 71.0 °F | 89.6 °F | 5.73 in. |
| July | 73.0 °F | 91.2 °F | 4.82 in. |
| August | 72.4 °F | 91.7 °F | 4.64 in. |
| September | 68.0 °F | 87.8 °F | 4.52 in. |
| October | 57.2 °F | 80.0 °F | 4.35 in. |
| November | 47.2 °F | 70.4 °F | 4.69 in. |
| December | 42.2 °F | 63.4 °F | 5.15 in. |
| Annual | 57.2 °F | 78 °F | 59.88 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |