Morrilton, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 22.4 °C (high). Annual precipitation averages 1303 Millimeters. Morrilton is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 9.8 °C | 88.14 mm |
| February | -0.3 °C | 12.7 °C | 98.81 mm |
| March | 3.9 °C | 17.6 °C | 129.54 mm |
| April | 8.8 °C | 22.4 °C | 138.18 mm |
| May | 14.4 °C | 26.6 °C | 136.91 mm |
| June | 19 °C | 31.1 °C | 87.88 mm |
| July | 20.9 °C | 33.4 °C | 99.31 mm |
| August | 20.3 °C | 33.3 °C | 96.01 mm |
| September | 15.9 °C | 29.5 °C | 89.41 mm |
| October | 9.3 °C | 23.8 °C | 101.35 mm |
| November | 3.5 °C | 16.7 °C | 117.6 mm |
| December | -0.3 °C | 11.4 °C | 119.89 mm |
| Annual | 9.5 °C | 22.4 °C | 1303.03 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |