Sheboygan, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 12 °C (high). Annual precipitation averages 841.5 Millimeters. Sheboygan 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 | -9.9 °C | -2.2 °C | 48.26 mm |
| February | -8.6 °C | -0.4 °C | 39.12 mm |
| March | -3.6 °C | 4.2 °C | 50.04 mm |
| April | 1.9 °C | 10 °C | 90.17 mm |
| May | 7.1 °C | 16.1 °C | 93.47 mm |
| June | 12.6 °C | 21.9 °C | 97.03 mm |
| July | 16.5 °C | 25.5 °C | 83.82 mm |
| August | 16.3 °C | 24.9 °C | 87.63 mm |
| September | 12.2 °C | 21.2 °C | 69.09 mm |
| October | 5.8 °C | 14.3 °C | 77.98 mm |
| November | -0.4 °C | 7.1 °C | 56.13 mm |
| December | -6.4 °C | 0.9 °C | 48.77 mm |
| Annual | 3.6 °C | 12 °C | 841.51 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |