McPherson, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 19.7 °C (high). Annual precipitation averages 825.2 Millimeters. McPherson 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.4 °C | 5.6 °C | 21.34 mm |
| February | -4.8 °C | 7.8 °C | 30.99 mm |
| March | 0.5 °C | 13.8 °C | 58.17 mm |
| April | 5.6 °C | 19.2 °C | 72.9 mm |
| May | 11.9 °C | 24.5 °C | 135.38 mm |
| June | 17.8 °C | 30.7 °C | 110.74 mm |
| July | 20.2 °C | 33.2 °C | 102.87 mm |
| August | 19.2 °C | 32.2 °C | 91.44 mm |
| September | 14.4 °C | 28 °C | 71.37 mm |
| October | 7.2 °C | 21.1 °C | 61.72 mm |
| November | 0.2 °C | 13.2 °C | 37.59 mm |
| December | -4.9 °C | 6.6 °C | 30.73 mm |
| Annual | 6.7 °C | 19.7 °C | 825.24 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |