Hazel Green, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.2 °C (high). Annual precipitation averages 1489.5 Millimeters. Hazel Green 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.9 °C | 9.4 °C | 137.92 mm |
| February | 0.4 °C | 11.8 °C | 137.67 mm |
| March | 4.2 °C | 16.5 °C | 136.65 mm |
| April | 8.9 °C | 21.6 °C | 131.57 mm |
| May | 14.2 °C | 25.9 °C | 116.08 mm |
| June | 18.2 °C | 29.4 °C | 123.44 mm |
| July | 20.2 °C | 31.2 °C | 124.97 mm |
| August | 19.3 °C | 30.9 °C | 108.46 mm |
| September | 15.7 °C | 28.1 °C | 103.63 mm |
| October | 9.1 °C | 22.6 °C | 95 mm |
| November | 3.3 °C | 16.1 °C | 115.82 mm |
| December | 0.6 °C | 11 °C | 158.24 mm |
| Annual | 9.4 °C | 21.2 °C | 1489.45 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |