Mahaska, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 17.9 °C (high). Annual precipitation averages 773.4 Millimeters. 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 | -8.8 °C | 3.1 °C | 17.53 mm |
| February | -7.1 °C | 5.8 °C | 23.11 mm |
| March | -1.9 °C | 12.3 °C | 41.91 mm |
| April | 3.8 °C | 17.9 °C | 70.1 mm |
| May | 10.3 °C | 23.2 °C | 117.6 mm |
| June | 16.3 °C | 29.2 °C | 113.79 mm |
| July | 18.9 °C | 31.7 °C | 109.22 mm |
| August | 17.7 °C | 30.2 °C | 89.15 mm |
| September | 12.4 °C | 26.3 °C | 73.91 mm |
| October | 5.3 °C | 19.3 °C | 56.9 mm |
| November | -1.7 °C | 11.2 °C | 33.53 mm |
| December | -6.8 °C | 4.6 °C | 26.67 mm |
| Annual | 4.9 °C | 17.9 °C | 773.42 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |