Croswell, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 56 °F (high). Annual precipitation averages 33.7 Inches. 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 | 16.3 °F | 29.8 °F | 2.28 in. |
| February | 16.4 °F | 32.0 °F | 1.86 in. |
| March | 24.6 °F | 41.2 °F | 2.07 in. |
| April | 34.3 °F | 53.3 °F | 3.16 in. |
| May | 45.7 °F | 65.4 °F | 3.47 in. |
| June | 55.2 °F | 75.5 °F | 3.31 in. |
| July | 60.4 °F | 80.4 °F | 3.13 in. |
| August | 59.1 °F | 78.8 °F | 3.26 in. |
| September | 51.9 °F | 73.1 °F | 3.19 in. |
| October | 41.9 °F | 60.1 °F | 3.06 in. |
| November | 31.8 °F | 46.9 °F | 2.59 in. |
| December | 22.8 °F | 35.3 °F | 2.3 in. |
| Annual | 38.4 °F | 56 °F | 33.68 in. |
| 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 : -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 |