Okolona, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 23.3 °C (high). Annual precipitation averages 1446.5 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 | -0.1 °C | 11.4 °C | 121.67 mm |
| February | 1.6 °C | 13.9 °C | 130.56 mm |
| March | 5.5 °C | 18.8 °C | 133.1 mm |
| April | 10.2 °C | 23.7 °C | 138.43 mm |
| May | 15.2 °C | 27.9 °C | 135.64 mm |
| June | 19.6 °C | 31.7 °C | 113.79 mm |
| July | 21.4 °C | 33.3 °C | 116.33 mm |
| August | 20.8 °C | 33.3 °C | 111.51 mm |
| September | 16.9 °C | 30.3 °C | 92.96 mm |
| October | 10.3 °C | 24.7 °C | 89.66 mm |
| November | 4.4 °C | 17.8 °C | 109.47 mm |
| December | 1.5 °C | 12.9 °C | 153.42 mm |
| Annual | 10.6 °C | 23.3 °C | 1446.54 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |