Bienville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.2 °F (low) to 76.5 °F (high). Annual precipitation averages 59.5 Inches. Bienville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.0 °F | 57.1 °F | 5.87 in. |
| February | 38.1 °F | 61.3 °F | 5.48 in. |
| March | 44.8 °F | 69.0 °F | 5.48 in. |
| April | 51.8 °F | 76.4 °F | 5.88 in. |
| May | 61.2 °F | 83.5 °F | 4.85 in. |
| June | 68.7 °F | 90.0 °F | 5.06 in. |
| July | 71.6 °F | 93.1 °F | 3.99 in. |
| August | 70.8 °F | 93.5 °F | 3.71 in. |
| September | 64.2 °F | 88.7 °F | 3.73 in. |
| October | 52.7 °F | 78.7 °F | 4.71 in. |
| November | 42.9 °F | 67.2 °F | 4.8 in. |
| December | 36.7 °F | 59.0 °F | 5.97 in. |
| Annual | 53.2 °F | 76.5 °F | 59.53 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |