Marion, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 19.4 °C (high). Annual precipitation averages 879.1 Millimeters. Marion is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 5 °C | 20.57 mm |
| February | -5.1 °C | 7.6 °C | 33.53 mm |
| March | 0.3 °C | 13.8 °C | 57.15 mm |
| April | 5.8 °C | 19.3 °C | 78.99 mm |
| May | 12.1 °C | 24.4 °C | 133.6 mm |
| June | 17.7 °C | 29.9 °C | 119.89 mm |
| July | 20.1 °C | 32.8 °C | 112.01 mm |
| August | 19.1 °C | 32 °C | 100.58 mm |
| September | 14.2 °C | 27.7 °C | 86.36 mm |
| October | 7 °C | 21 °C | 64.01 mm |
| November | 0.3 °C | 13.1 °C | 40.89 mm |
| December | -5 °C | 6.5 °C | 31.5 mm |
| Annual | 6.6 °C | 19.4 °C | 879.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |