Egg Harbor, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 11.4 °C (high). Annual precipitation averages 801.6 Millimeters. Egg Harbor is located in USDA Plant Hardiness Zone 5b. 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 | -10.7 °C | -3.3 °C | 42.42 mm |
| February | -10.4 °C | -1.9 °C | 29.21 mm |
| March | -5.6 °C | 3.4 °C | 44.7 mm |
| April | 0.7 °C | 9.5 °C | 74.42 mm |
| May | 6.9 °C | 16.7 °C | 85.09 mm |
| June | 12.6 °C | 22.6 °C | 90.68 mm |
| July | 15.6 °C | 25.3 °C | 84.07 mm |
| August | 15.7 °C | 24.6 °C | 81.53 mm |
| September | 11.6 °C | 20.5 °C | 82.3 mm |
| October | 5.6 °C | 13.4 °C | 84.07 mm |
| November | -0.3 °C | 6.2 °C | 56.39 mm |
| December | -6.2 °C | 0.1 °C | 46.74 mm |
| Annual | 3 °C | 11.4 °C | 801.62 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |