Mackinaw City, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 50.7 °F (high). Annual precipitation averages 31.8 Inches. Mackinaw City is located in USDA Plant Hardiness Zone 5b. 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 | 13.0 °F | 25.7 °F | 1.89 in. |
| February | 11.8 °F | 27.2 °F | 1.34 in. |
| March | 19.2 °F | 35.3 °F | 1.7 in. |
| April | 31.0 °F | 46.3 °F | 2.7 in. |
| May | 41.8 °F | 58.6 °F | 2.95 in. |
| June | 52.3 °F | 68.9 °F | 2.87 in. |
| July | 58.7 °F | 74.9 °F | 2.85 in. |
| August | 58.3 °F | 74.4 °F | 3.05 in. |
| September | 51.6 °F | 67.5 °F | 3.43 in. |
| October | 40.6 °F | 54.7 °F | 4.18 in. |
| November | 31.3 °F | 42.6 °F | 2.57 in. |
| December | 21.8 °F | 32.6 °F | 2.26 in. |
| Annual | 36 °F | 50.7 °F | 31.79 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |