Heflin, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.3 °F (low) to 72 °F (high). Annual precipitation averages 57.2 Inches. Heflin 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.3 °F | 52.9 °F | 5.43 in. |
| February | 33.9 °F | 56.9 °F | 5.89 in. |
| March | 40.0 °F | 65.0 °F | 5.59 in. |
| April | 47.2 °F | 72.8 °F | 4.64 in. |
| May | 56.6 °F | 79.3 °F | 4.8 in. |
| June | 64.4 °F | 85.5 °F | 4.8 in. |
| July | 68.0 °F | 88.2 °F | 4.94 in. |
| August | 67.2 °F | 87.7 °F | 4.17 in. |
| September | 61.1 °F | 83.1 °F | 3.48 in. |
| October | 49.3 °F | 73.8 °F | 3.45 in. |
| November | 38.6 °F | 63.4 °F | 4.77 in. |
| December | 33.8 °F | 55.4 °F | 5.19 in. |
| Annual | 49.3 °F | 72 °F | 57.15 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |