Millport, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 23.7 °C (high). Annual precipitation averages 1430.5 Millimeters. Millport 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 | 0.4 °C | 12.3 °C | 136.91 mm |
| February | 2.1 °C | 14.8 °C | 141.73 mm |
| March | 5.9 °C | 19.5 °C | 134.87 mm |
| April | 10.2 °C | 24 °C | 137.92 mm |
| May | 15.3 °C | 28.1 °C | 103.89 mm |
| June | 19.7 °C | 31.7 °C | 120.14 mm |
| July | 21.5 °C | 33.2 °C | 119.89 mm |
| August | 20.9 °C | 33.2 °C | 107.95 mm |
| September | 17.3 °C | 30.5 °C | 86.11 mm |
| October | 10.5 °C | 25.1 °C | 92.2 mm |
| November | 4.6 °C | 18.4 °C | 110.24 mm |
| December | 1.8 °C | 13.6 °C | 138.68 mm |
| Annual | 10.9 °C | 23.7 °C | 1430.53 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |