Winfield, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 22.8 °C (high). Annual precipitation averages 1587.3 Millimeters. Winfield is located in USDA Plant Hardiness Zone 7b. 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 | -1.1 °C | 11.3 °C | 148.34 mm |
| February | 0.7 °C | 13.8 °C | 152.91 mm |
| March | 4.4 °C | 18.6 °C | 139.45 mm |
| April | 8.6 °C | 23.1 °C | 153.67 mm |
| May | 13.9 °C | 27.1 °C | 140.46 mm |
| June | 18.4 °C | 30.7 °C | 129.54 mm |
| July | 20.4 °C | 32.3 °C | 131.83 mm |
| August | 19.9 °C | 32.3 °C | 111.76 mm |
| September | 16.1 °C | 29.7 °C | 98.04 mm |
| October | 9.3 °C | 24.1 °C | 99.57 mm |
| November | 3.3 °C | 17.6 °C | 119.89 mm |
| December | 0.6 °C | 12.7 °C | 161.8 mm |
| Annual | 9.5 °C | 22.8 °C | 1587.26 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |