Marion, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.5 °F (low) to 54.1 °F (high). Annual precipitation averages 34.7 Inches. 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 | 6.6 °F | 22.9 °F | 0.91 in. |
| February | 10.2 °F | 27.3 °F | 0.99 in. |
| March | 22.4 °F | 39.7 °F | 1.87 in. |
| April | 34.7 °F | 54.9 °F | 3.49 in. |
| May | 46.9 °F | 67.4 °F | 4.56 in. |
| June | 57.4 °F | 77.3 °F | 5.48 in. |
| July | 61.0 °F | 80.6 °F | 4.12 in. |
| August | 58.5 °F | 78.4 °F | 4.3 in. |
| September | 50.4 °F | 71.8 °F | 3.73 in. |
| October | 37.9 °F | 58.3 °F | 2.44 in. |
| November | 25.7 °F | 42.0 °F | 1.6 in. |
| December | 13.9 °F | 28.6 °F | 1.2 in. |
| Annual | 35.5 °F | 54.1 °F | 34.69 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |