Zilwaukee, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.9 °F (low) to 57.2 °F (high). Annual precipitation averages 33.8 Inches. Zilwaukee 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.3 °F | 29.7 °F | 2.06 in. |
| February | 15.7 °F | 32.3 °F | 1.77 in. |
| March | 23.8 °F | 42.3 °F | 1.89 in. |
| April | 34.8 °F | 55.8 °F | 3.51 in. |
| May | 46.6 °F | 68.5 °F | 3.66 in. |
| June | 56.4 °F | 78.4 °F | 3.72 in. |
| July | 59.9 °F | 82.3 °F | 3.09 in. |
| August | 58.2 °F | 80.2 °F | 3.48 in. |
| September | 50.4 °F | 74.0 °F | 2.83 in. |
| October | 40.2 °F | 60.7 °F | 3.24 in. |
| November | 30.7 °F | 46.8 °F | 2.54 in. |
| December | 22.2 °F | 35.1 °F | 2.03 in. |
| Annual | 37.9 °F | 57.2 °F | 33.82 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |