Plains, Kansas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 41.5 °F (low) to 69.5 °F (high). Annual precipitation averages 20.6 Inches. 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 | 19.4 °F | 46.4 °F | 0.55 in. |
| February | 22.1 °F | 50.3 °F | 0.5 in. |
| March | 30.2 °F | 59.8 °F | 1.29 in. |
| April | 38.8 °F | 68.3 °F | 1.64 in. |
| May | 50.1 °F | 78.2 °F | 2.32 in. |
| June | 61.0 °F | 88.3 °F | 3.25 in. |
| July | 65.6 °F | 92.5 °F | 3.31 in. |
| August | 63.8 °F | 90.3 °F | 2.88 in. |
| September | 55.5 °F | 83.8 °F | 1.44 in. |
| October | 41.9 °F | 71.4 °F | 1.79 in. |
| November | 29.3 °F | 58.1 °F | 0.71 in. |
| December | 20.8 °F | 46.8 °F | 0.93 in. |
| Annual | 41.5 °F | 69.5 °F | 20.61 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |