Vermillion, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 64 °F (high). Annual precipitation averages 33.9 Inches. Vermillion 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 | 16.6 °F | 36.7 °F | 0.76 in. |
| February | 20.2 °F | 41.8 °F | 1.11 in. |
| March | 30.3 °F | 53.8 °F | 2.09 in. |
| April | 40.5 °F | 64.5 °F | 3.29 in. |
| May | 52.2 °F | 73.9 °F | 4.98 in. |
| June | 62.5 °F | 83.6 °F | 4.73 in. |
| July | 66.5 °F | 88.0 °F | 4.38 in. |
| August | 64.3 °F | 86.7 °F | 3.73 in. |
| September | 55.0 °F | 79.2 °F | 3.32 in. |
| October | 42.5 °F | 67.2 °F | 2.64 in. |
| November | 30.6 °F | 52.5 °F | 1.69 in. |
| December | 20.9 °F | 40.5 °F | 1.22 in. |
| Annual | 41.8 °F | 64 °F | 33.94 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 |