Marvell, 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 1339.4 Millimeters. Marvell 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0 °C | 9.5 °C | 107.19 mm |
| February | 1.7 °C | 12.1 °C | 116.33 mm |
| March | 6.1 °C | 17 °C | 137.16 mm |
| April | 11.1 °C | 22.4 °C | 148.84 mm |
| May | 16.4 °C | 27.1 °C | 130.56 mm |
| June | 20.7 °C | 31.2 °C | 99.06 mm |
| July | 22.2 °C | 32.6 °C | 94.49 mm |
| August | 21.2 °C | 32.6 °C | 73.66 mm |
| September | 17.3 °C | 29.6 °C | 76.71 mm |
| October | 10.9 °C | 23.8 °C | 100.08 mm |
| November | 5.3 °C | 16.5 °C | 113.28 mm |
| December | 1.7 °C | 11.1 °C | 141.99 mm |
| Annual | 11.2 °C | 22.1 °C | 1339.35 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |