Windsor, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.2 °F (low) to 56.5 °F (high). Annual precipitation averages 37.1 Inches. Windsor is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.6 °F | 27.0 °F | 1.41 in. |
| February | 13.6 °F | 31.1 °F | 1.48 in. |
| March | 24.0 °F | 43.1 °F | 2.09 in. |
| April | 35.5 °F | 56.6 °F | 3.79 in. |
| May | 47.4 °F | 68.9 °F | 4.29 in. |
| June | 57.6 °F | 78.5 °F | 5.39 in. |
| July | 61.6 °F | 82.1 °F | 4.4 in. |
| August | 59.6 °F | 80.3 °F | 4.07 in. |
| September | 51.2 °F | 73.2 °F | 3.48 in. |
| October | 39.6 °F | 60.1 °F | 2.86 in. |
| November | 28.1 °F | 45.1 °F | 2.15 in. |
| December | 17.6 °F | 32.5 °F | 1.67 in. |
| Annual | 37.2 °F | 56.5 °F | 37.08 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |