Wilton, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.1 °F (low) to 51.6 °F (high). Annual precipitation averages 19.2 Inches. Wilton is located in USDA Plant Hardiness Zone 4a. 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 | 1.3 °F | 19.7 °F | 0.51 in. |
| February | 4.9 °F | 24.0 °F | 0.45 in. |
| March | 16.6 °F | 36.9 °F | 0.69 in. |
| April | 29.8 °F | 51.8 °F | 1.23 in. |
| May | 41.8 °F | 64.9 °F | 2.69 in. |
| June | 51.7 °F | 74.2 °F | 3.62 in. |
| July | 57.1 °F | 80.6 °F | 3.12 in. |
| August | 54.7 °F | 80.3 °F | 2.23 in. |
| September | 45.1 °F | 70.3 °F | 1.84 in. |
| October | 32.3 °F | 54.0 °F | 1.38 in. |
| November | 18.6 °F | 37.4 °F | 0.63 in. |
| December | 7.4 °F | 24.7 °F | 0.77 in. |
| Annual | 30.1 °F | 51.6 °F | 19.16 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |