Dermott, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.9 °C (low) to 23.5 °C (high). Annual precipitation averages 1399.3 Millimeters. Dermott 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 | 1.1 °C | 11.3 °C | 138.68 mm |
| February | 2.7 °C | 13.9 °C | 126.24 mm |
| March | 7.1 °C | 18.7 °C | 137.41 mm |
| April | 11.8 °C | 23.7 °C | 150.88 mm |
| May | 16.9 °C | 28.2 °C | 123.7 mm |
| June | 21.1 °C | 31.9 °C | 81.79 mm |
| July | 22.6 °C | 33.4 °C | 100.84 mm |
| August | 21.6 °C | 33.4 °C | 87.12 mm |
| September | 17.8 °C | 30.8 °C | 87.88 mm |
| October | 11.4 °C | 25.2 °C | 102.11 mm |
| November | 6.1 °C | 18.2 °C | 114.81 mm |
| December | 2.6 °C | 12.8 °C | 147.83 mm |
| Annual | 11.9 °C | 23.5 °C | 1399.29 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |