Winfield, Kansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 20.7 °C (high). Annual precipitation averages 983.7 Millimeters. Winfield is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 7.1 °C | 25.4 mm |
| February | -3.2 °C | 9.8 °C | 37.59 mm |
| March | 1.9 °C | 15.4 °C | 71.12 mm |
| April | 7.2 °C | 20.6 °C | 97.03 mm |
| May | 13.4 °C | 25.3 °C | 144.78 mm |
| June | 18.8 °C | 30.5 °C | 141.22 mm |
| July | 21.3 °C | 33.3 °C | 102.62 mm |
| August | 20.2 °C | 32.7 °C | 108.2 mm |
| September | 15.6 °C | 28.6 °C | 74.42 mm |
| October | 8.6 °C | 22.1 °C | 90.42 mm |
| November | 2.1 °C | 14.8 °C | 51.31 mm |
| December | -3.3 °C | 8.2 °C | 39.62 mm |
| Annual | 8.1 °C | 20.7 °C | 983.73 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |