Willis, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.6 °F (low) to 64.3 °F (high). Annual precipitation averages 37 Inches. Willis is located in USDA Plant Hardiness Zone 6a. 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 | 16.7 °F | 36.2 °F | 0.77 in. |
| February | 20.5 °F | 41.8 °F | 1.23 in. |
| March | 30.6 °F | 53.9 °F | 2.14 in. |
| April | 41.2 °F | 64.5 °F | 3.72 in. |
| May | 53.6 °F | 74.8 °F | 5.27 in. |
| June | 63.7 °F | 84.2 °F | 4.88 in. |
| July | 67.6 °F | 88.2 °F | 5.15 in. |
| August | 65.3 °F | 86.6 °F | 4.06 in. |
| September | 55.4 °F | 79.6 °F | 3.65 in. |
| October | 43.2 °F | 67.7 °F | 2.93 in. |
| November | 31.1 °F | 52.8 °F | 1.82 in. |
| December | 22.3 °F | 40.8 °F | 1.36 in. |
| Annual | 42.6 °F | 64.3 °F | 36.98 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |