Vermillion, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 17.8 °C (high). Annual precipitation averages 862.1 Millimeters. 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 | -8.6 °C | 2.6 °C | 19.3 mm |
| February | -6.6 °C | 5.4 °C | 28.19 mm |
| March | -0.9 °C | 12.1 °C | 53.09 mm |
| April | 4.7 °C | 18.1 °C | 83.57 mm |
| May | 11.2 °C | 23.3 °C | 126.49 mm |
| June | 16.9 °C | 28.7 °C | 120.14 mm |
| July | 19.2 °C | 31.1 °C | 111.25 mm |
| August | 17.9 °C | 30.4 °C | 94.74 mm |
| September | 12.8 °C | 26.2 °C | 84.33 mm |
| October | 5.8 °C | 19.6 °C | 67.06 mm |
| November | -0.8 °C | 11.4 °C | 42.93 mm |
| December | -6.2 °C | 4.7 °C | 30.99 mm |
| Annual | 5.5 °C | 17.8 °C | 862.08 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |