Rockwell, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 22.8 °C (high). Annual precipitation averages 1373.6 Millimeters. Rockwell is located in USDA Plant Hardiness Zone 8a. 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 | -0.8 °C | 10.9 °C | 93.47 mm |
| February | 0.8 °C | 13.4 °C | 109.73 mm |
| March | 4.8 °C | 18.2 °C | 131.32 mm |
| April | 9.3 °C | 23.1 °C | 139.19 mm |
| May | 14.9 °C | 26.9 °C | 147.83 mm |
| June | 19.4 °C | 31.2 °C | 110.24 mm |
| July | 21.3 °C | 33.5 °C | 105.16 mm |
| August | 20.6 °C | 33.6 °C | 83.82 mm |
| September | 16.6 °C | 29.8 °C | 88.65 mm |
| October | 9.8 °C | 23.9 °C | 118.36 mm |
| November | 4.3 °C | 17.1 °C | 121.41 mm |
| December | 0.5 °C | 12.2 °C | 124.46 mm |
| Annual | 10.1 °C | 22.8 °C | 1373.64 mm |
| 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |