Heflin, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.3 °F (low) to 76.1 °F (high). Annual precipitation averages 55.9 Inches. Heflin is located in USDA Plant Hardiness Zone 8b. 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 | 34.8 °F | 56.7 °F | 5.28 in. |
| February | 37.9 °F | 61.0 °F | 4.96 in. |
| March | 44.6 °F | 68.5 °F | 5.38 in. |
| April | 51.9 °F | 76.0 °F | 5.31 in. |
| May | 61.5 °F | 83.2 °F | 4.63 in. |
| June | 69.2 °F | 89.7 °F | 4.66 in. |
| July | 72.0 °F | 93.0 °F | 3.81 in. |
| August | 71.3 °F | 93.5 °F | 3.38 in. |
| September | 64.7 °F | 88.4 °F | 3.82 in. |
| October | 52.8 °F | 78.1 °F | 4.65 in. |
| November | 42.8 °F | 66.8 °F | 4.52 in. |
| December | 36.6 °F | 58.7 °F | 5.52 in. |
| Annual | 53.3 °F | 76.1 °F | 55.92 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |