Gwinner, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 11.5 °C (high). Annual precipitation averages 597.2 Millimeters. Gwinner 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 | -16.9 °C | -6.9 °C | 14.99 mm |
| February | -14.8 °C | -4.2 °C | 15.24 mm |
| March | -7.8 °C | 2.7 °C | 24.89 mm |
| April | -0.5 °C | 11.7 °C | 44.7 mm |
| May | 6.9 °C | 19.5 °C | 79.76 mm |
| June | 13.2 °C | 24.8 °C | 107.44 mm |
| July | 15.3 °C | 27.3 °C | 90.17 mm |
| August | 13.8 °C | 26.8 °C | 60.71 mm |
| September | 8.4 °C | 22.4 °C | 66.55 mm |
| October | 1.1 °C | 13.6 °C | 56.39 mm |
| November | -6.5 °C | 3.8 °C | 18.8 mm |
| December | -12.9 °C | -3.6 °C | 17.53 mm |
| Annual | -0.1 °C | 11.5 °C | 597.17 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |