Onaway, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 54.6 °F (high). Annual precipitation averages 31.9 Inches. Onaway is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.0 °F | 26.5 °F | 2.01 in. |
| February | 9.8 °F | 29.3 °F | 1.45 in. |
| March | 17.1 °F | 39.3 °F | 1.78 in. |
| April | 29.1 °F | 52.8 °F | 2.9 in. |
| May | 40.7 °F | 66.9 °F | 3.07 in. |
| June | 50.3 °F | 76.4 °F | 2.92 in. |
| July | 55.1 °F | 80.4 °F | 3.09 in. |
| August | 53.8 °F | 78.8 °F | 3.26 in. |
| September | 46.7 °F | 71.4 °F | 3.21 in. |
| October | 37.0 °F | 57.4 °F | 3.56 in. |
| November | 28.1 °F | 43.2 °F | 2.44 in. |
| December | 18.8 °F | 32.2 °F | 2.16 in. |
| Annual | 33.1 °F | 54.6 °F | 31.85 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |