Croswell, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 13.3 °C (high). Annual precipitation averages 855.5 Millimeters. Croswell is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | -1.2 °C | 57.91 mm |
| February | -8.7 °C | 0 °C | 47.24 mm |
| March | -4.1 °C | 5.1 °C | 52.58 mm |
| April | 1.3 °C | 11.8 °C | 80.26 mm |
| May | 7.6 °C | 18.6 °C | 88.14 mm |
| June | 12.9 °C | 24.2 °C | 84.07 mm |
| July | 15.8 °C | 26.9 °C | 79.5 mm |
| August | 15.1 °C | 26 °C | 82.8 mm |
| September | 11.1 °C | 22.8 °C | 81.03 mm |
| October | 5.5 °C | 15.6 °C | 77.72 mm |
| November | -0.1 °C | 8.3 °C | 65.79 mm |
| December | -5.1 °C | 1.8 °C | 58.42 mm |
| Annual | 3.6 °C | 13.3 °C | 855.46 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |