Gwinn, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 10.7 °C (high). Annual precipitation averages 822.5 Millimeters. Gwinn is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.3 °C | -4.4 °C | 43.43 mm |
| February | -13.7 °C | -2.7 °C | 36.07 mm |
| March | -9.1 °C | 2.6 °C | 44.7 mm |
| April | -2.3 °C | 9.2 °C | 68.07 mm |
| May | 4.3 °C | 17 °C | 78.49 mm |
| June | 9.7 °C | 22.7 °C | 88.14 mm |
| July | 12.6 °C | 25.4 °C | 92.2 mm |
| August | 11.7 °C | 24.4 °C | 73.66 mm |
| September | 7.8 °C | 20 °C | 93.22 mm |
| October | 1.7 °C | 11.9 °C | 95 mm |
| November | -3.7 °C | 4.3 °C | 58.93 mm |
| December | -9.8 °C | -1.8 °C | 50.55 mm |
| Annual | -0.3 °C | 10.7 °C | 822.46 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |