Pinckney, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 14.5 °C (high). Annual precipitation averages 873.3 Millimeters. Pinckney 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 | -9.2 °C | -0.6 °C | 58.17 mm |
| February | -8.7 °C | 1.1 °C | 46.74 mm |
| March | -4.2 °C | 6.8 °C | 56.64 mm |
| April | 2 °C | 14.2 °C | 77.22 mm |
| May | 8.2 °C | 20.8 °C | 96.52 mm |
| June | 13.4 °C | 25.8 °C | 94.74 mm |
| July | 15.4 °C | 28 °C | 86.87 mm |
| August | 14.8 °C | 27 °C | 86.36 mm |
| September | 10.6 °C | 23.4 °C | 78.23 mm |
| October | 4.4 °C | 16.2 °C | 73.15 mm |
| November | -0.8 °C | 8.7 °C | 64.52 mm |
| December | -5.6 °C | 2.2 °C | 54.1 mm |
| Annual | 3.4 °C | 14.5 °C | 873.26 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |