Guntersville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.8 °F (low) to 71.7 °F (high). Annual precipitation averages 55.7 Inches. Guntersville 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 | 31.7 °F | 50.9 °F | 5.24 in. |
| February | 34.4 °F | 55.2 °F | 5.38 in. |
| March | 41.4 °F | 63.6 °F | 5.1 in. |
| April | 49.1 °F | 72.2 °F | 5.02 in. |
| May | 58.4 °F | 79.7 °F | 4.43 in. |
| June | 66.5 °F | 86.4 °F | 4.78 in. |
| July | 69.9 °F | 89.0 °F | 3.96 in. |
| August | 69.0 °F | 89.0 °F | 3.84 in. |
| September | 63.0 °F | 84.2 °F | 4.08 in. |
| October | 51.1 °F | 74.0 °F | 3.71 in. |
| November | 40.0 °F | 62.2 °F | 4.53 in. |
| December | 34.5 °F | 53.7 °F | 5.59 in. |
| Annual | 50.8 °F | 71.7 °F | 55.66 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 |