Winter, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.3 °F (low) to 51.9 °F (high). Annual precipitation averages 33.6 Inches. Winter is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.4 °F | 21.3 °F | 1.08 in. |
| February | 3.8 °F | 26.7 °F | 1.0 in. |
| March | 15.7 °F | 38.5 °F | 1.6 in. |
| April | 29.1 °F | 51.9 °F | 2.76 in. |
| May | 41.3 °F | 65.5 °F | 3.84 in. |
| June | 51.2 °F | 74.6 °F | 4.59 in. |
| July | 55.7 °F | 78.5 °F | 4.36 in. |
| August | 53.2 °F | 76.4 °F | 3.65 in. |
| September | 45.9 °F | 68.9 °F | 4.09 in. |
| October | 34.3 °F | 54.7 °F | 3.48 in. |
| November | 22.3 °F | 38.9 °F | 1.75 in. |
| December | 9.6 °F | 26.3 °F | 1.37 in. |
| Annual | 30.3 °F | 51.9 °F | 33.57 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |