Hays, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 19.6 °C (high). Annual precipitation averages 617.8 Millimeters. Hays is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 5.7 °C | 13.21 mm |
| February | -6.4 °C | 7.9 °C | 19.81 mm |
| March | -1.3 °C | 13.8 °C | 33.02 mm |
| April | 3.8 °C | 19 °C | 53.09 mm |
| May | 10.2 °C | 24.4 °C | 89.66 mm |
| June | 16.3 °C | 30.7 °C | 83.31 mm |
| July | 19.1 °C | 33.5 °C | 100.08 mm |
| August | 17.8 °C | 32.1 °C | 84.84 mm |
| September | 12.9 °C | 27.9 °C | 52.58 mm |
| October | 5.2 °C | 20.8 °C | 44.2 mm |
| November | -1.7 °C | 13.1 °C | 22.61 mm |
| December | -6.7 °C | 6.5 °C | 21.34 mm |
| Annual | 5.1 °C | 19.6 °C | 617.75 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |