Franklin, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.8 °F (low) to 76.1 °F (high). Annual precipitation averages 54.9 Inches. Franklin is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.3 °F | 57.8 °F | 4.97 in. |
| February | 38.1 °F | 62.0 °F | 5.02 in. |
| March | 44.1 °F | 69.7 °F | 5.79 in. |
| April | 50.6 °F | 76.6 °F | 4.45 in. |
| May | 59.8 °F | 83.6 °F | 3.86 in. |
| June | 67.6 °F | 89.0 °F | 4.84 in. |
| July | 70.8 °F | 91.2 °F | 5.03 in. |
| August | 70.0 °F | 90.8 °F | 4.48 in. |
| September | 64.8 °F | 87.0 °F | 3.78 in. |
| October | 53.3 °F | 77.9 °F | 2.93 in. |
| November | 42.1 °F | 67.9 °F | 4.51 in. |
| December | 37.6 °F | 60.2 °F | 5.24 in. |
| Annual | 52.8 °F | 76.1 °F | 54.9 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |