Wishek, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 11 °C (high). Annual precipitation averages 522.5 Millimeters. Wishek is located in USDA Plant Hardiness Zone 4b. 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 | -17.1 °C | -6.9 °C | 12.45 mm |
| February | -14.7 °C | -4.3 °C | 16.26 mm |
| March | -8.4 °C | 2.4 °C | 22.35 mm |
| April | -1.6 °C | 11.4 °C | 35.31 mm |
| May | 5.5 °C | 18.3 °C | 74.93 mm |
| June | 11.6 °C | 23.5 °C | 97.03 mm |
| July | 14.3 °C | 27 °C | 83.06 mm |
| August | 12.9 °C | 26.4 °C | 60.2 mm |
| September | 7.8 °C | 21.6 °C | 50.8 mm |
| October | 0.5 °C | 12.7 °C | 43.18 mm |
| November | -7.3 °C | 3.6 °C | 13.97 mm |
| December | -13.3 °C | -3.9 °C | 12.95 mm |
| Annual | -0.8 °C | 11 °C | 522.49 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 4b : -31.7°C to -28.9°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 |