Marthaville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.8 °F (low) to 77.2 °F (high). Annual precipitation averages 55.8 Inches. Marthaville is located in USDA Plant Hardiness Zone 8b. 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 | 36.9 °F | 58.3 °F | 5.48 in. |
| February | 40.0 °F | 62.6 °F | 4.77 in. |
| March | 46.8 °F | 70.0 °F | 5.26 in. |
| April | 54.1 °F | 77.2 °F | 5.07 in. |
| May | 62.7 °F | 84.1 °F | 4.59 in. |
| June | 69.9 °F | 90.3 °F | 4.59 in. |
| July | 72.5 °F | 93.0 °F | 3.92 in. |
| August | 71.8 °F | 93.7 °F | 3.84 in. |
| September | 65.5 °F | 88.7 °F | 3.65 in. |
| October | 54.2 °F | 79.4 °F | 4.4 in. |
| November | 44.4 °F | 68.4 °F | 4.73 in. |
| December | 38.7 °F | 60.2 °F | 5.53 in. |
| Annual | 54.8 °F | 77.2 °F | 55.83 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |