Ashley, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 14.1 °C (high). Annual precipitation averages 862.1 Millimeters. Ashley 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 | -9.7 °C | -1.2 °C | 55.12 mm |
| February | -9.6 °C | 0.2 °C | 45.47 mm |
| March | -4.8 °C | 6.2 °C | 51.82 mm |
| April | 1.2 °C | 13.6 °C | 87.38 mm |
| May | 7.8 °C | 20.4 °C | 96.77 mm |
| June | 13.3 °C | 25.8 °C | 88.65 mm |
| July | 15.2 °C | 27.9 °C | 81.03 mm |
| August | 14 °C | 26.9 °C | 86.87 mm |
| September | 9.6 °C | 23.3 °C | 72.9 mm |
| October | 3.9 °C | 15.9 °C | 80.77 mm |
| November | -1.1 °C | 8.3 °C | 64.01 mm |
| December | -5.8 °C | 1.8 °C | 51.31 mm |
| Annual | 2.8 °C | 14.1 °C | 862.1 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |