Otsego, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 14.7 °C (high). Annual precipitation averages 1034.3 Millimeters. Otsego is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8 °C | -0.1 °C | 80.77 mm |
| February | -7.8 °C | 1.3 °C | 56.39 mm |
| March | -3.8 °C | 7.2 °C | 62.48 mm |
| April | 2 °C | 14.5 °C | 96.27 mm |
| May | 8.2 °C | 20.8 °C | 110.24 mm |
| June | 13.1 °C | 25.9 °C | 102.62 mm |
| July | 15.1 °C | 28.1 °C | 93.47 mm |
| August | 14.5 °C | 27.2 °C | 97.79 mm |
| September | 10.3 °C | 23.8 °C | 86.61 mm |
| October | 4.5 °C | 16.4 °C | 99.82 mm |
| November | -0.4 °C | 8.9 °C | 78.49 mm |
| December | -4.7 °C | 2.6 °C | 69.34 mm |
| Annual | 3.6 °C | 14.7 °C | 1034.29 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |