Clayton, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 14.7 °C (high). Annual precipitation averages 912.6 Millimeters. Clayton 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 | -8.9 °C | -0.4 °C | 60.2 mm |
| February | -8.4 °C | 1.3 °C | 54.1 mm |
| March | -3.7 °C | 7 °C | 62.23 mm |
| April | 2.3 °C | 14.3 °C | 80.52 mm |
| May | 8.7 °C | 20.9 °C | 97.79 mm |
| June | 14.1 °C | 26.3 °C | 95 mm |
| July | 15.8 °C | 28.3 °C | 86.87 mm |
| August | 14.8 °C | 27.3 °C | 90.42 mm |
| September | 10.5 °C | 23.9 °C | 80.52 mm |
| October | 4.4 °C | 16.6 °C | 73.15 mm |
| November | -1 °C | 8.8 °C | 73.41 mm |
| December | -5.4 °C | 2.3 °C | 58.42 mm |
| Annual | 3.6 °C | 14.7 °C | 912.63 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |