Winfield, West Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 19.1 °C (high). Annual precipitation averages 1040.4 Millimeters. Winfield is located in USDA Plant Hardiness Zone 7a. 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 | -4.8 °C | 5.8 °C | 78.49 mm |
| February | -3.8 °C | 7.9 °C | 68.07 mm |
| March | -0.3 °C | 13.1 °C | 101.35 mm |
| April | 5.1 °C | 20.1 °C | 82.04 mm |
| May | 10.8 °C | 24.6 °C | 107.19 mm |
| June | 15.6 °C | 28.4 °C | 100.33 mm |
| July | 18 °C | 30.3 °C | 116.08 mm |
| August | 17.2 °C | 29.7 °C | 85.85 mm |
| September | 13.3 °C | 26.6 °C | 76.45 mm |
| October | 6.6 °C | 20.4 °C | 70.61 mm |
| November | 0.7 °C | 13.7 °C | 69.6 mm |
| December | -2.4 °C | 8 °C | 84.33 mm |
| Annual | 6.3 °C | 19.1 °C | 1040.39 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |