Wisner, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25 °C (high). Annual precipitation averages 1478.8 Millimeters. Wisner 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 | 2.8 °C | 14.2 °C | 143 mm |
| February | 4.2 °C | 16.6 °C | 133.6 mm |
| March | 8.3 °C | 21 °C | 137.67 mm |
| April | 12.3 °C | 25 °C | 149.1 mm |
| May | 17.1 °C | 29.2 °C | 120.14 mm |
| June | 21 °C | 32.4 °C | 117.35 mm |
| July | 22.4 °C | 33.8 °C | 107.95 mm |
| August | 21.8 °C | 34.1 °C | 97.03 mm |
| September | 18.7 °C | 31.5 °C | 93.98 mm |
| October | 12.3 °C | 26.6 °C | 110.24 mm |
| November | 6.9 °C | 20.2 °C | 127 mm |
| December | 3.8 °C | 15.5 °C | 141.73 mm |
| Annual | 12.6 °C | 25 °C | 1478.79 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |