Walnut Grove, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.6 °F (low) to 75.9 °F (high). Annual precipitation averages 60.8 Inches. Walnut Grove is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.9 °F | 56.9 °F | 5.88 in. |
| February | 36.9 °F | 61.3 °F | 6.07 in. |
| March | 43.6 °F | 68.9 °F | 5.78 in. |
| April | 50.5 °F | 76.2 °F | 6.4 in. |
| May | 59.1 °F | 83.1 °F | 4.55 in. |
| June | 66.8 °F | 89.4 °F | 4.23 in. |
| July | 69.5 °F | 91.8 °F | 5.53 in. |
| August | 68.7 °F | 91.5 °F | 4.48 in. |
| September | 62.9 °F | 87.4 °F | 3.66 in. |
| October | 50.7 °F | 78.2 °F | 3.94 in. |
| November | 40.6 °F | 67.0 °F | 4.77 in. |
| December | 36.1 °F | 59.1 °F | 5.48 in. |
| Annual | 51.6 °F | 75.9 °F | 60.77 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |