Okolona, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 23.2 °C (high). Annual precipitation averages 1426.2 Millimeters. Okolona 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 | -0.4 °C | 11.6 °C | 105.66 mm |
| February | 1.3 °C | 14.1 °C | 113.54 mm |
| March | 5.3 °C | 18.8 °C | 136.4 mm |
| April | 9.7 °C | 23.4 °C | 139.45 mm |
| May | 15.2 °C | 27.1 °C | 161.54 mm |
| June | 19.7 °C | 31.4 °C | 104.39 mm |
| July | 21.5 °C | 33.4 °C | 111.76 mm |
| August | 20.9 °C | 33.5 °C | 86.36 mm |
| September | 17.1 °C | 30.1 °C | 96.27 mm |
| October | 10.3 °C | 24.2 °C | 120.65 mm |
| November | 4.6 °C | 17.6 °C | 116.59 mm |
| December | 0.9 °C | 12.8 °C | 133.6 mm |
| Annual | 10.5 °C | 23.2 °C | 1426.21 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |