Wahpeton, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 11.4 °C (high). Annual precipitation averages 633.2 Millimeters. Wahpeton 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 | -17.3 °C | -7.6 °C | 17.53 mm |
| February | -15.3 °C | -5.1 °C | 16.26 mm |
| March | -7.7 °C | 2.2 °C | 25.15 mm |
| April | 0.1 °C | 11.9 °C | 50.04 mm |
| May | 7.3 °C | 19.9 °C | 80.77 mm |
| June | 13.6 °C | 25.1 °C | 102.11 mm |
| July | 15.7 °C | 27.6 °C | 92.71 mm |
| August | 13.8 °C | 26.8 °C | 75.44 mm |
| September | 9.1 °C | 22.2 °C | 71.88 mm |
| October | 1.9 °C | 13.5 °C | 63.25 mm |
| November | -5.8 °C | 3.9 °C | 19.3 mm |
| December | -13.1 °C | -4.1 °C | 18.8 mm |
| Annual | 0.2 °C | 11.4 °C | 633.24 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |