Egg Harbor, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.3 °F (low) to 52.6 °F (high). Annual precipitation averages 31.6 Inches. 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 | 12.7 °F | 26.0 °F | 1.67 in. |
| February | 13.2 °F | 28.6 °F | 1.15 in. |
| March | 21.9 °F | 38.2 °F | 1.76 in. |
| April | 33.3 °F | 49.1 °F | 2.93 in. |
| May | 44.5 °F | 62.0 °F | 3.35 in. |
| June | 54.7 °F | 72.7 °F | 3.57 in. |
| July | 60.1 °F | 77.6 °F | 3.31 in. |
| August | 60.2 °F | 76.2 °F | 3.21 in. |
| September | 52.8 °F | 68.9 °F | 3.24 in. |
| October | 42.1 °F | 56.1 °F | 3.31 in. |
| November | 31.4 °F | 43.1 °F | 2.22 in. |
| December | 20.9 °F | 32.1 °F | 1.84 in. |
| Annual | 37.3 °F | 52.6 °F | 31.56 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |