Walthall, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.2 °C (high). Annual precipitation averages 1464.8 Millimeters. Walthall is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.1 °C | 12 °C | 132.84 mm |
| February | 1.4 °C | 14.3 °C | 130.56 mm |
| March | 5.4 °C | 19.1 °C | 139.19 mm |
| April | 9.7 °C | 23.7 °C | 150.11 mm |
| May | 14.8 °C | 27.5 °C | 130.3 mm |
| June | 19.1 °C | 31 °C | 113.79 mm |
| July | 20.9 °C | 32.6 °C | 114.3 mm |
| August | 20.3 °C | 32.5 °C | 104.9 mm |
| September | 16.7 °C | 29.8 °C | 97.03 mm |
| October | 10.3 °C | 24.6 °C | 92.46 mm |
| November | 4.4 °C | 18 °C | 112.27 mm |
| December | 1.4 °C | 13.2 °C | 147.07 mm |
| Annual | 10.4 °C | 23.2 °C | 1464.82 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |