Dumas, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.3 °F (low) to 71.3 °F (high). Annual precipitation averages 58 Inches. Dumas is located in USDA Plant Hardiness Zone 7b. 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 | 29.9 °F | 49.8 °F | 4.92 in. |
| February | 32.6 °F | 54.3 °F | 5.05 in. |
| March | 39.9 °F | 63.3 °F | 5.38 in. |
| April | 48.2 °F | 72.2 °F | 5.63 in. |
| May | 57.8 °F | 79.5 °F | 5.33 in. |
| June | 65.6 °F | 86.4 °F | 4.8 in. |
| July | 69.1 °F | 89.4 °F | 4.58 in. |
| August | 67.6 °F | 89.1 °F | 3.78 in. |
| September | 60.6 °F | 83.9 °F | 4.02 in. |
| October | 48.5 °F | 73.3 °F | 3.93 in. |
| November | 38.3 °F | 61.7 °F | 4.34 in. |
| December | 32.9 °F | 52.5 °F | 6.19 in. |
| Annual | 49.3 °F | 71.3 °F | 57.95 in. |
| 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |