Otsego, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.5 °F (low) to 58.5 °F (high). Annual precipitation averages 40.7 Inches. 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 | 17.6 °F | 31.8 °F | 3.18 in. |
| February | 18.0 °F | 34.3 °F | 2.22 in. |
| March | 25.2 °F | 44.9 °F | 2.46 in. |
| April | 35.6 °F | 58.1 °F | 3.79 in. |
| May | 46.7 °F | 69.5 °F | 4.34 in. |
| June | 55.5 °F | 78.6 °F | 4.04 in. |
| July | 59.2 °F | 82.5 °F | 3.68 in. |
| August | 58.1 °F | 81.0 °F | 3.85 in. |
| September | 50.6 °F | 74.8 °F | 3.41 in. |
| October | 40.1 °F | 61.6 °F | 3.93 in. |
| November | 31.3 °F | 48.1 °F | 3.09 in. |
| December | 23.5 °F | 36.7 °F | 2.73 in. |
| Annual | 38.5 °F | 58.5 °F | 40.72 in. |
| 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 : -10°F to -5°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 |