Harpersville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.2 °F (low) to 75.3 °F (high). Annual precipitation averages 56.2 Inches. Harpersville 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.5 °F | 55.6 °F | 5.22 in. |
| February | 35.4 °F | 60.2 °F | 5.48 in. |
| March | 41.3 °F | 68.1 °F | 5.4 in. |
| April | 48.4 °F | 76.2 °F | 4.94 in. |
| May | 57.4 °F | 82.9 °F | 4.44 in. |
| June | 65.4 °F | 88.9 °F | 4.86 in. |
| July | 68.8 °F | 91.8 °F | 4.59 in. |
| August | 67.9 °F | 91.1 °F | 4.18 in. |
| September | 62.0 °F | 86.9 °F | 3.98 in. |
| October | 49.8 °F | 77.4 °F | 3.32 in. |
| November | 39.2 °F | 66.2 °F | 4.48 in. |
| December | 34.8 °F | 58.1 °F | 5.27 in. |
| Annual | 50.2 °F | 75.3 °F | 56.16 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |