Hamilton, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 22.7 °C (high). Annual precipitation averages 1565.1 Millimeters. Hamilton is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.3 °C | 10.9 °C | 142.49 mm |
| February | 0.6 °C | 13.7 °C | 146.56 mm |
| March | 4.3 °C | 18.6 °C | 134.62 mm |
| April | 8.8 °C | 23.3 °C | 147.07 mm |
| May | 14.1 °C | 27.1 °C | 147.83 mm |
| June | 18.5 °C | 30.8 °C | 127 mm |
| July | 20.3 °C | 32.4 °C | 131.06 mm |
| August | 19.9 °C | 32.5 °C | 112.01 mm |
| September | 16 °C | 29.8 °C | 104.39 mm |
| October | 9.3 °C | 23.9 °C | 92.96 mm |
| November | 3.2 °C | 17.4 °C | 118.11 mm |
| December | 0.4 °C | 12.5 °C | 161.04 mm |
| Annual | 9.5 °C | 22.7 °C | 1565.14 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |