Ellison Bay, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.6 °F (low) to 51.8 °F (high). Annual precipitation averages 30.8 Inches. Ellison Bay 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 | 13.6 °F | 26.7 °F | 1.73 in. |
| February | 13.9 °F | 28.6 °F | 1.07 in. |
| March | 22.0 °F | 37.7 °F | 1.69 in. |
| April | 32.9 °F | 48.1 °F | 2.84 in. |
| May | 43.6 °F | 60.5 °F | 3.29 in. |
| June | 54.2 °F | 70.8 °F | 3.29 in. |
| July | 60.1 °F | 75.5 °F | 3.0 in. |
| August | 60.5 °F | 74.8 °F | 3.07 in. |
| September | 53.5 °F | 67.5 °F | 3.33 in. |
| October | 42.9 °F | 56.1 °F | 3.44 in. |
| November | 32.1 °F | 43.2 °F | 2.31 in. |
| December | 22.0 °F | 32.6 °F | 1.76 in. |
| Annual | 37.6 °F | 51.8 °F | 30.82 in. |
| 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 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 |