Keo, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.1 °F (low) to 72 °F (high). Annual precipitation averages 51.4 Inches. Keo 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.1 °F | 50.1 °F | 3.92 in. |
| February | 35.1 °F | 54.9 °F | 4.09 in. |
| March | 42.5 °F | 63.5 °F | 4.98 in. |
| April | 51.4 °F | 72.8 °F | 5.6 in. |
| May | 61.2 °F | 80.5 °F | 4.96 in. |
| June | 69.2 °F | 87.8 °F | 3.35 in. |
| July | 72.2 °F | 90.7 °F | 3.63 in. |
| August | 70.7 °F | 90.2 °F | 3.07 in. |
| September | 63.4 °F | 84.5 °F | 3.49 in. |
| October | 51.5 °F | 74.4 °F | 4.18 in. |
| November | 41.4 °F | 62.1 °F | 4.59 in. |
| December | 34.7 °F | 52.8 °F | 5.49 in. |
| Annual | 52.1 °F | 72 °F | 51.35 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |