Northport, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.4 °C (low) to 24.2 °C (high). Annual precipitation averages 1396.2 Millimeters. Northport 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 | 1.2 °C | 13.2 °C | 137.41 mm |
| February | 2.8 °C | 15.7 °C | 137.92 mm |
| March | 6.5 °C | 20.3 °C | 127.51 mm |
| April | 10.6 °C | 24.4 °C | 129.54 mm |
| May | 15.6 °C | 28.3 °C | 97.28 mm |
| June | 19.9 °C | 31.9 °C | 121.67 mm |
| July | 21.7 °C | 33.3 °C | 109.73 mm |
| August | 21.3 °C | 33.2 °C | 111.25 mm |
| September | 18.1 °C | 30.8 °C | 88.9 mm |
| October | 11.4 °C | 25.3 °C | 87.12 mm |
| November | 5.3 °C | 19.1 °C | 119.89 mm |
| December | 2.7 °C | 14.4 °C | 128.02 mm |
| Annual | 11.4 °C | 24.2 °C | 1396.24 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |