Winfield, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.8 °C (low) to 24.2 °C (high). Annual precipitation averages 1218.7 Millimeters. Winfield 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 | 1.1 °C | 13.1 °C | 87.63 mm |
| February | 3 °C | 15.3 °C | 98.04 mm |
| March | 6.9 °C | 19.7 °C | 114.3 mm |
| April | 10.8 °C | 23.9 °C | 109.73 mm |
| May | 16.3 °C | 27.9 °C | 129.29 mm |
| June | 20.7 °C | 32.1 °C | 107.7 mm |
| July | 22.6 °C | 34.3 °C | 78.23 mm |
| August | 21.9 °C | 34.6 °C | 69.34 mm |
| September | 18.2 °C | 31.3 °C | 92.96 mm |
| October | 11.8 °C | 25.4 °C | 119.63 mm |
| November | 6.4 °C | 19.1 °C | 93.73 mm |
| December | 2.2 °C | 14.2 °C | 118.11 mm |
| Annual | 11.8 °C | 24.2 °C | 1218.69 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |