Wales, 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 8.5 °C (high). Annual precipitation averages 528.3 Millimeters. Wales 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.4 °C | -10.7 °C | 14.99 mm |
| February | -18.8 °C | -8.1 °C | 15.24 mm |
| March | -11.3 °C | -1.3 °C | 19.81 mm |
| April | -2.6 °C | 9.1 °C | 25.65 mm |
| May | 4.4 °C | 17.5 °C | 68.83 mm |
| June | 10.7 °C | 22.5 °C | 101.35 mm |
| July | 12.9 °C | 25.1 °C | 83.57 mm |
| August | 11.5 °C | 25 °C | 66.8 mm |
| September | 6.5 °C | 20 °C | 51.31 mm |
| October | -0.7 °C | 10.8 °C | 38.61 mm |
| November | -8.8 °C | 0.3 °C | 22.35 mm |
| December | -16.5 °C | -7.7 °C | 19.81 mm |
| Annual | -2.8 °C | 8.5 °C | 528.32 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 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 |