Mio, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.5 °F (low) to 55.1 °F (high). Annual precipitation averages 30.6 Inches. Mio 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.0 °F | 27.2 °F | 1.74 in. |
| February | 9.0 °F | 30.3 °F | 1.35 in. |
| March | 17.1 °F | 40.7 °F | 1.69 in. |
| April | 29.0 °F | 53.6 °F | 2.95 in. |
| May | 40.8 °F | 67.3 °F | 3.11 in. |
| June | 50.4 °F | 76.9 °F | 3.34 in. |
| July | 54.9 °F | 80.7 °F | 3.21 in. |
| August | 53.2 °F | 79.1 °F | 3.22 in. |
| September | 45.5 °F | 71.7 °F | 2.79 in. |
| October | 35.2 °F | 57.5 °F | 3.17 in. |
| November | 26.6 °F | 43.8 °F | 2.12 in. |
| December | 18.0 °F | 32.7 °F | 1.9 in. |
| Annual | 32.5 °F | 55.1 °F | 30.59 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 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 |