Marion, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.9 °F (low) to 52 °F (high). Annual precipitation averages 21.9 Inches. Marion is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.5 °F | 18.6 °F | 0.53 in. |
| February | 4.2 °F | 23.6 °F | 0.57 in. |
| March | 16.7 °F | 35.9 °F | 1.01 in. |
| April | 30.0 °F | 52.7 °F | 1.36 in. |
| May | 43.4 °F | 66.3 °F | 3.06 in. |
| June | 54.6 °F | 76.1 °F | 3.78 in. |
| July | 58.8 °F | 80.9 °F | 3.55 in. |
| August | 55.6 °F | 79.8 °F | 2.31 in. |
| September | 46.3 °F | 71.4 °F | 2.37 in. |
| October | 33.3 °F | 55.6 °F | 1.96 in. |
| November | 19.5 °F | 38.3 °F | 0.66 in. |
| December | 7.6 °F | 24.3 °F | 0.72 in. |
| Annual | 30.9 °F | 52 °F | 21.88 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |