Stewartville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51 °F (low) to 74.2 °F (high). Annual precipitation averages 57.1 Inches. Stewartville 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.2 °F | 55.3 °F | 5.48 in. |
| February | 36.2 °F | 59.8 °F | 5.63 in. |
| March | 42.1 °F | 67.5 °F | 5.48 in. |
| April | 48.9 °F | 74.7 °F | 4.96 in. |
| May | 57.9 °F | 81.6 °F | 4.32 in. |
| June | 65.8 °F | 87.3 °F | 4.89 in. |
| July | 69.1 °F | 90.2 °F | 4.81 in. |
| August | 68.5 °F | 89.6 °F | 4.38 in. |
| September | 62.6 °F | 85.1 °F | 3.83 in. |
| October | 51.0 °F | 75.8 °F | 3.35 in. |
| November | 40.5 °F | 65.6 °F | 4.56 in. |
| December | 35.7 °F | 57.6 °F | 5.4 in. |
| Annual | 51 °F | 74.2 °F | 57.09 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |