Bienville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.8 °C (low) to 24.7 °C (high). Annual precipitation averages 1512.1 Millimeters. 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 | 1.7 °C | 13.9 °C | 149.1 mm |
| February | 3.4 °C | 16.3 °C | 139.19 mm |
| March | 7.1 °C | 20.6 °C | 139.19 mm |
| April | 11 °C | 24.7 °C | 149.35 mm |
| May | 16.2 °C | 28.6 °C | 123.19 mm |
| June | 20.4 °C | 32.2 °C | 128.52 mm |
| July | 22 °C | 33.9 °C | 101.35 mm |
| August | 21.6 °C | 34.2 °C | 94.23 mm |
| September | 17.9 °C | 31.5 °C | 94.74 mm |
| October | 11.5 °C | 25.9 °C | 119.63 mm |
| November | 6.1 °C | 19.6 °C | 121.92 mm |
| December | 2.6 °C | 15 °C | 151.64 mm |
| Annual | 11.8 °C | 24.7 °C | 1512.05 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |