Manitowoc, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 11.5 °C (high). Annual precipitation averages 810.5 Millimeters. Manitowoc is located in USDA Plant Hardiness Zone 5b. 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 | -10.2 °C | -2.6 °C | 38.1 mm |
| February | -9.1 °C | -1.2 °C | 30.73 mm |
| March | -4.1 °C | 3.6 °C | 43.94 mm |
| April | 1.7 °C | 9.8 °C | 84.33 mm |
| May | 6.9 °C | 16.2 °C | 87.12 mm |
| June | 12.3 °C | 21.9 °C | 107.7 mm |
| July | 15.9 °C | 25.1 °C | 95.76 mm |
| August | 15.9 °C | 24.4 °C | 89.15 mm |
| September | 11.8 °C | 20.7 °C | 61.21 mm |
| October | 5.5 °C | 13.6 °C | 73.15 mm |
| November | -0.8 °C | 6.4 °C | 52.83 mm |
| December | -6.7 °C | 0.5 °C | 46.48 mm |
| Annual | 3.3 °C | 11.5 °C | 810.5 mm |
| 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 5b : -26.1°C to -23.3°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 |