Arion, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.2 °C (low) to 15.2 °C (high). Annual precipitation averages 837.2 Millimeters. Arion is located in USDA Plant Hardiness Zone 5b. 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 | -11.8 °C | -1.6 °C | 18.54 mm |
| February | -9.6 °C | 1.2 °C | 24.13 mm |
| March | -3.4 °C | 8.5 °C | 45.72 mm |
| April | 2.5 °C | 15.9 °C | 86.87 mm |
| May | 9.3 °C | 21.8 °C | 118.36 mm |
| June | 15.3 °C | 27.3 °C | 124.21 mm |
| July | 17.4 °C | 29 °C | 99.31 mm |
| August | 15.8 °C | 27.8 °C | 109.22 mm |
| September | 10.8 °C | 24.6 °C | 82.04 mm |
| October | 3.9 °C | 17.5 °C | 62.23 mm |
| November | -3.2 °C | 8.6 °C | 36.07 mm |
| December | -8.7 °C | 1.2 °C | 30.48 mm |
| Annual | 3.2 °C | 15.2 °C | 837.18 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |