Mahaska, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 64.2 °F (high). Annual precipitation averages 30.5 Inches. Mahaska is located in USDA Plant Hardiness Zone 6a. 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 | 16.2 °F | 37.6 °F | 0.69 in. |
| February | 19.3 °F | 42.4 °F | 0.91 in. |
| March | 28.6 °F | 54.1 °F | 1.65 in. |
| April | 38.8 °F | 64.3 °F | 2.76 in. |
| May | 50.6 °F | 73.7 °F | 4.63 in. |
| June | 61.4 °F | 84.6 °F | 4.48 in. |
| July | 66.1 °F | 89.1 °F | 4.3 in. |
| August | 63.8 °F | 86.3 °F | 3.51 in. |
| September | 54.4 °F | 79.4 °F | 2.91 in. |
| October | 41.6 °F | 66.8 °F | 2.24 in. |
| November | 28.9 °F | 52.2 °F | 1.32 in. |
| December | 19.8 °F | 40.2 °F | 1.05 in. |
| Annual | 40.8 °F | 64.2 °F | 30.45 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |