Pinckney, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 58 °F (high). Annual precipitation averages 34.4 Inches. 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 | 15.5 °F | 31.0 °F | 2.29 in. |
| February | 16.3 °F | 33.9 °F | 1.84 in. |
| March | 24.4 °F | 44.3 °F | 2.23 in. |
| April | 35.6 °F | 57.5 °F | 3.04 in. |
| May | 46.8 °F | 69.4 °F | 3.8 in. |
| June | 56.2 °F | 78.4 °F | 3.73 in. |
| July | 59.7 °F | 82.4 °F | 3.42 in. |
| August | 58.7 °F | 80.6 °F | 3.4 in. |
| September | 51.1 °F | 74.2 °F | 3.08 in. |
| October | 40.0 °F | 61.1 °F | 2.88 in. |
| November | 30.5 °F | 47.6 °F | 2.54 in. |
| December | 22.0 °F | 36.0 °F | 2.13 in. |
| Annual | 38.1 °F | 58 °F | 34.38 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |