Wilmar, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 23.6 °C (high). Annual precipitation averages 1420.6 Millimeters. Wilmar is located in USDA Plant Hardiness Zone 8b. 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 | 0.4 °C | 12 °C | 122.68 mm |
| February | 2.1 °C | 14.5 °C | 121.16 mm |
| March | 6.3 °C | 19.1 °C | 139.7 mm |
| April | 10.9 °C | 23.8 °C | 153.42 mm |
| May | 16.1 °C | 27.9 °C | 126.75 mm |
| June | 20.2 °C | 31.9 °C | 96.52 mm |
| July | 21.9 °C | 33.5 °C | 93.47 mm |
| August | 21.1 °C | 33.4 °C | 99.31 mm |
| September | 17.4 °C | 30.6 °C | 89.41 mm |
| October | 10.8 °C | 24.9 °C | 116.08 mm |
| November | 5.3 °C | 18.2 °C | 112.52 mm |
| December | 1.8 °C | 13.3 °C | 149.61 mm |
| Annual | 11.2 °C | 23.6 °C | 1420.63 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 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |