Petoskey, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 11.5 °C (high). Annual precipitation averages 878.6 Millimeters. Petoskey is located in USDA Plant Hardiness Zone 5b. 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 | -9.9 °C | -2.6 °C | 62.48 mm |
| February | -10.7 °C | -1.8 °C | 39.88 mm |
| March | -6.9 °C | 3.1 °C | 46.99 mm |
| April | -0.4 °C | 9.7 °C | 73.15 mm |
| May | 5.9 °C | 17.2 °C | 76.2 mm |
| June | 11.6 °C | 22.2 °C | 73.41 mm |
| July | 14.6 °C | 24.6 °C | 67.56 mm |
| August | 14.2 °C | 24.4 °C | 83.06 mm |
| September | 10.4 °C | 20.8 °C | 92.96 mm |
| October | 4.4 °C | 13.4 °C | 110.74 mm |
| November | -0.6 °C | 6.4 °C | 81.28 mm |
| December | -5.4 °C | 0.8 °C | 70.87 mm |
| Annual | 2.3 °C | 11.5 °C | 878.58 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 5b : -26.1°C to -23.3°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 |