Marion, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.3 °C (high). Annual precipitation averages 881.1 Millimeters. Marion is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.1 °C | -5.1 °C | 23.11 mm |
| February | -12.1 °C | -2.6 °C | 25.15 mm |
| March | -5.3 °C | 4.3 °C | 47.5 mm |
| April | 1.5 °C | 12.7 °C | 88.65 mm |
| May | 8.3 °C | 19.7 °C | 115.82 mm |
| June | 14.1 °C | 25.2 °C | 139.19 mm |
| July | 16.1 °C | 27 °C | 104.65 mm |
| August | 14.7 °C | 25.8 °C | 109.22 mm |
| September | 10.2 °C | 22.1 °C | 94.74 mm |
| October | 3.3 °C | 14.6 °C | 61.98 mm |
| November | -3.5 °C | 5.6 °C | 40.64 mm |
| December | -10.1 °C | -1.9 °C | 30.48 mm |
| Annual | 1.9 °C | 12.3 °C | 881.13 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |