Westboro, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.4 °F (low) to 51.3 °F (high). Annual precipitation averages 32.7 Inches. Westboro 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °F | 21.1 °F | 1.11 in. |
| February | 3.5 °F | 25.8 °F | 1.02 in. |
| March | 15.4 °F | 37.5 °F | 1.62 in. |
| April | 28.9 °F | 51.3 °F | 2.83 in. |
| May | 41.7 °F | 64.8 °F | 3.71 in. |
| June | 51.7 °F | 73.7 °F | 4.53 in. |
| July | 55.6 °F | 77.8 °F | 3.84 in. |
| August | 53.5 °F | 75.9 °F | 3.89 in. |
| September | 45.8 °F | 68.1 °F | 3.76 in. |
| October | 33.9 °F | 54.2 °F | 3.11 in. |
| November | 22.8 °F | 38.7 °F | 1.86 in. |
| December | 9.8 °F | 26.1 °F | 1.42 in. |
| Annual | 30.4 °F | 51.3 °F | 32.7 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 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 |