Gwinn, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.4 °F (low) to 51.3 °F (high). Annual precipitation averages 32.4 Inches. 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 | 8.0 °F | 24.0 °F | 1.71 in. |
| February | 7.4 °F | 27.2 °F | 1.42 in. |
| March | 15.7 °F | 36.7 °F | 1.76 in. |
| April | 27.8 °F | 48.5 °F | 2.68 in. |
| May | 39.8 °F | 62.6 °F | 3.09 in. |
| June | 49.4 °F | 72.9 °F | 3.47 in. |
| July | 54.6 °F | 77.7 °F | 3.63 in. |
| August | 53.1 °F | 76.0 °F | 2.9 in. |
| September | 46.0 °F | 68.0 °F | 3.67 in. |
| October | 35.0 °F | 53.4 °F | 3.74 in. |
| November | 25.3 °F | 39.8 °F | 2.32 in. |
| December | 14.4 °F | 28.7 °F | 1.99 in. |
| Annual | 31.4 °F | 51.3 °F | 32.38 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |