Marthaville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.7 °C (low) to 25.1 °C (high). Annual precipitation averages 1418.1 Millimeters. 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 | 2.7 °C | 14.6 °C | 139.19 mm |
| February | 4.4 °C | 17 °C | 121.16 mm |
| March | 8.2 °C | 21.1 °C | 133.6 mm |
| April | 12.3 °C | 25.1 °C | 128.78 mm |
| May | 17.1 °C | 28.9 °C | 116.59 mm |
| June | 21.1 °C | 32.4 °C | 116.59 mm |
| July | 22.5 °C | 33.9 °C | 99.57 mm |
| August | 22.1 °C | 34.3 °C | 97.54 mm |
| September | 18.6 °C | 31.5 °C | 92.71 mm |
| October | 12.3 °C | 26.3 °C | 111.76 mm |
| November | 6.9 °C | 20.2 °C | 120.14 mm |
| December | 3.7 °C | 15.7 °C | 140.46 mm |
| Annual | 12.7 °C | 25.1 °C | 1418.09 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |