Shaftsburg, 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 °C (high). Annual precipitation averages 869.7 Millimeters. Shaftsburg 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | -0.9 °C | 56.64 mm |
| February | -8.8 °C | 0.6 °C | 46.99 mm |
| March | -4.2 °C | 6.3 °C | 52.32 mm |
| April | 2.1 °C | 13.4 °C | 85.09 mm |
| May | 8.4 °C | 20.2 °C | 98.3 mm |
| June | 13.7 °C | 25.4 °C | 93.47 mm |
| July | 15.4 °C | 27.5 °C | 81.53 mm |
| August | 14.6 °C | 26.6 °C | 82.8 mm |
| September | 10.3 °C | 23.1 °C | 77.72 mm |
| October | 4.3 °C | 15.8 °C | 78.23 mm |
| November | -0.9 °C | 8.3 °C | 64.52 mm |
| December | -5.4 °C | 1.9 °C | 52.07 mm |
| Annual | 3.4 °C | 14 °C | 869.68 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 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 |