Clayton, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.5 °C (low) to 18.9 °C (high). Annual precipitation averages 543.8 Millimeters. Clayton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.2 °C | 5 °C | 8.64 mm |
| February | -7.8 °C | 7 °C | 10.67 mm |
| March | -3.1 °C | 13.2 °C | 25.65 mm |
| April | 2.2 °C | 18.3 °C | 49.28 mm |
| May | 8.7 °C | 23.6 °C | 88.65 mm |
| June | 14.8 °C | 30.1 °C | 72.9 mm |
| July | 17.8 °C | 32.9 °C | 89.15 mm |
| August | 16.5 °C | 31.6 °C | 76.45 mm |
| September | 11.1 °C | 27.3 °C | 46.99 mm |
| October | 3.4 °C | 19.9 °C | 43.18 mm |
| November | -3.7 °C | 12.2 °C | 17.27 mm |
| December | -8.3 °C | 5.7 °C | 14.99 mm |
| Annual | 3.5 °C | 18.9 °C | 543.82 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |