Plains, Kansas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 5.3 °C (low) to 20.9 °C (high). Annual precipitation averages 523.5 Millimeters. Plains is located in USDA Plant Hardiness Zone 6b. 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 | -7 °C | 8 °C | 13.97 mm |
| February | -5.5 °C | 10.2 °C | 12.7 mm |
| March | -1 °C | 15.4 °C | 32.77 mm |
| April | 3.8 °C | 20.2 °C | 41.66 mm |
| May | 10.1 °C | 25.7 °C | 58.93 mm |
| June | 16.1 °C | 31.3 °C | 82.55 mm |
| July | 18.7 °C | 33.6 °C | 84.07 mm |
| August | 17.7 °C | 32.4 °C | 73.15 mm |
| September | 13.1 °C | 28.8 °C | 36.58 mm |
| October | 5.5 °C | 21.9 °C | 45.47 mm |
| November | -1.5 °C | 14.5 °C | 18.03 mm |
| December | -6.2 °C | 8.2 °C | 23.62 mm |
| Annual | 5.3 °C | 20.9 °C | 523.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |