Milton, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.8 °C (low) to 8.6 °C (high). Annual precipitation averages 552.4 Millimeters. Milton is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.4 °C | -10.6 °C | 14.48 mm |
| February | -18.9 °C | -8.1 °C | 13.46 mm |
| March | -11.3 °C | -1.2 °C | 20.32 mm |
| April | -2.5 °C | 9 °C | 23.62 mm |
| May | 4.6 °C | 17.4 °C | 82.3 mm |
| June | 10.8 °C | 22.5 °C | 102.87 mm |
| July | 12.9 °C | 25.1 °C | 84.58 mm |
| August | 11.5 °C | 25.2 °C | 68.58 mm |
| September | 6.3 °C | 20 °C | 58.42 mm |
| October | -0.8 °C | 10.9 °C | 40.89 mm |
| November | -8.9 °C | 0.7 °C | 23.11 mm |
| December | -16.4 °C | -7.4 °C | 19.81 mm |
| Annual | -2.8 °C | 8.6 °C | 552.44 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |