Wahpeton, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 52.5 °F (high). Annual precipitation averages 24.9 Inches. 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 | 0.8 °F | 18.4 °F | 0.69 in. |
| February | 4.4 °F | 22.9 °F | 0.64 in. |
| March | 18.1 °F | 35.9 °F | 0.99 in. |
| April | 32.1 °F | 53.4 °F | 1.97 in. |
| May | 45.2 °F | 67.8 °F | 3.18 in. |
| June | 56.5 °F | 77.1 °F | 4.02 in. |
| July | 60.2 °F | 81.6 °F | 3.65 in. |
| August | 56.9 °F | 80.3 °F | 2.97 in. |
| September | 48.3 °F | 72.0 °F | 2.83 in. |
| October | 35.4 °F | 56.3 °F | 2.49 in. |
| November | 21.6 °F | 39.0 °F | 0.76 in. |
| December | 8.4 °F | 24.7 °F | 0.74 in. |
| Annual | 32.3 °F | 52.5 °F | 24.93 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 |