Milnor, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32 °F (low) to 52.5 °F (high). Annual precipitation averages 23.7 Inches. Milnor is located in USDA Plant Hardiness Zone 4a. 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 | 0.9 °F | 18.8 °F | 0.63 in. |
| February | 4.9 °F | 23.6 °F | 0.61 in. |
| March | 17.6 °F | 36.3 °F | 0.98 in. |
| April | 31.7 °F | 53.2 °F | 1.71 in. |
| May | 44.9 °F | 67.4 °F | 3.09 in. |
| June | 56.2 °F | 76.9 °F | 4.26 in. |
| July | 59.8 °F | 81.5 °F | 3.47 in. |
| August | 57.1 °F | 80.1 °F | 2.52 in. |
| September | 47.6 °F | 72.1 °F | 2.65 in. |
| October | 34.5 °F | 56.4 °F | 2.27 in. |
| November | 20.8 °F | 38.8 °F | 0.77 in. |
| December | 8.3 °F | 24.9 °F | 0.73 in. |
| Annual | 32 °F | 52.5 °F | 23.69 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 4a : -30°F to -25°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 |