De Valls Bluff, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 22.1 °C (high). Annual precipitation averages 1283.7 Millimeters. De Valls Bluff is located in USDA Plant Hardiness Zone 8a. 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 | -0.1 °C | 9.3 °C | 96.01 mm |
| February | 1.6 °C | 12.2 °C | 104.39 mm |
| March | 5.9 °C | 17.1 °C | 130.05 mm |
| April | 10.9 °C | 22.4 °C | 142.24 mm |
| May | 16.3 °C | 27 °C | 133.6 mm |
| June | 20.8 °C | 31.3 °C | 83.82 mm |
| July | 22.4 °C | 32.8 °C | 85.09 mm |
| August | 21.4 °C | 32.6 °C | 72.9 mm |
| September | 17.3 °C | 29.3 °C | 80.26 mm |
| October | 10.7 °C | 23.7 °C | 106.17 mm |
| November | 5.3 °C | 16.4 °C | 112.52 mm |
| December | 1.5 °C | 11.1 °C | 136.65 mm |
| Annual | 11.2 °C | 22.1 °C | 1283.7 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |