Dumas, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.4 °F (low) to 73.4 °F (high). Annual precipitation averages 51.9 Inches. Dumas 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.0 °F | 51.7 °F | 4.39 in. |
| February | 36.8 °F | 56.5 °F | 4.33 in. |
| March | 44.5 °F | 65.0 °F | 5.14 in. |
| April | 52.9 °F | 74.4 °F | 5.77 in. |
| May | 62.5 °F | 82.0 °F | 5.09 in. |
| June | 69.8 °F | 88.8 °F | 3.23 in. |
| July | 72.5 °F | 91.3 °F | 3.31 in. |
| August | 70.7 °F | 90.9 °F | 3.06 in. |
| September | 64.2 °F | 86.0 °F | 3.06 in. |
| October | 52.7 °F | 76.0 °F | 4.44 in. |
| November | 43.1 °F | 63.8 °F | 4.49 in. |
| December | 36.7 °F | 54.4 °F | 5.59 in. |
| Annual | 53.4 °F | 73.4 °F | 51.9 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |