Port Wing, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 50.4 °F (high). Annual precipitation averages 30.1 Inches. Port Wing is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.0 °F | 22.2 °F | 1.07 in. |
| February | 8.0 °F | 26.7 °F | 1.09 in. |
| March | 18.1 °F | 36.3 °F | 1.67 in. |
| April | 29.6 °F | 47.5 °F | 2.86 in. |
| May | 39.2 °F | 60.4 °F | 3.16 in. |
| June | 48.3 °F | 69.6 °F | 3.67 in. |
| July | 56.1 °F | 77.1 °F | 3.86 in. |
| August | 55.9 °F | 76.0 °F | 3.2 in. |
| September | 48.8 °F | 67.7 °F | 3.12 in. |
| October | 37.6 °F | 53.9 °F | 2.8 in. |
| November | 26.1 °F | 39.4 °F | 1.91 in. |
| December | 13.9 °F | 27.4 °F | 1.64 in. |
| Annual | 32.3 °F | 50.4 °F | 30.05 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |