Mio, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 12.9 °C (high). Annual precipitation averages 777 Millimeters. 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 | -12.2 °C | -2.7 °C | 44.2 mm |
| February | -12.8 °C | -0.9 °C | 34.29 mm |
| March | -8.3 °C | 4.8 °C | 42.93 mm |
| April | -1.7 °C | 12 °C | 74.93 mm |
| May | 4.9 °C | 19.6 °C | 78.99 mm |
| June | 10.2 °C | 24.9 °C | 84.84 mm |
| July | 12.7 °C | 27.1 °C | 81.53 mm |
| August | 11.8 °C | 26.2 °C | 81.79 mm |
| September | 7.5 °C | 22.1 °C | 70.87 mm |
| October | 1.8 °C | 14.2 °C | 80.52 mm |
| November | -3 °C | 6.6 °C | 53.85 mm |
| December | -7.8 °C | 0.4 °C | 48.26 mm |
| Annual | 0.3 °C | 12.9 °C | 777 mm |
| 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 : -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 |