Otsego, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 12.4 °C (high). Annual precipitation averages 809 Millimeters. Otsego is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.9 °C | -5.2 °C | 19.56 mm |
| February | -13.1 °C | -2.6 °C | 20.83 mm |
| March | -6.2 °C | 4.6 °C | 39.12 mm |
| April | 1.1 °C | 12.8 °C | 72.64 mm |
| May | 8.3 °C | 20.2 °C | 107.95 mm |
| June | 14.2 °C | 25.5 °C | 114.3 mm |
| July | 16.7 °C | 28.1 °C | 108.2 mm |
| August | 15.2 °C | 26.7 °C | 102.11 mm |
| September | 10.6 °C | 22.3 °C | 87.12 mm |
| October | 3.3 °C | 14 °C | 68.83 mm |
| November | -3.7 °C | 5.3 °C | 40.13 mm |
| December | -10.8 °C | -2.4 °C | 28.19 mm |
| Annual | 1.7 °C | 12.4 °C | 808.98 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°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 |