Winfield, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.8 °C (low) to 19.5 °C (high). Annual precipitation averages 1463.1 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 7.2 °C | 119.38 mm |
| February | -2.5 °C | 9.4 °C | 126.24 mm |
| March | 1.1 °C | 14.3 °C | 144.02 mm |
| April | 5.9 °C | 20.2 °C | 131.32 mm |
| May | 11.3 °C | 24.4 °C | 124.21 mm |
| June | 15.6 °C | 28.2 °C | 129.29 mm |
| July | 17.8 °C | 29.7 °C | 151.64 mm |
| August | 17.1 °C | 29.3 °C | 106.43 mm |
| September | 13.3 °C | 26.5 °C | 99.82 mm |
| October | 6.4 °C | 20.9 °C | 83.31 mm |
| November | 0.9 °C | 14.3 °C | 100.08 mm |
| December | -1.8 °C | 9.1 °C | 147.32 mm |
| Annual | 6.8 °C | 19.5 °C | 1463.06 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |