Fenwood, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 11.5 °C (high). Annual precipitation averages 824 Millimeters. Fenwood is located in USDA Plant Hardiness Zone 4b. 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 | -14.9 °C | -5.3 °C | 26.16 mm |
| February | -13.7 °C | -2.9 °C | 23.62 mm |
| March | -7.3 °C | 3.8 °C | 40.13 mm |
| April | -0.1 °C | 11.7 °C | 73.66 mm |
| May | 6.8 °C | 18.8 °C | 94.49 mm |
| June | 12.3 °C | 23.9 °C | 122.94 mm |
| July | 14.5 °C | 26.4 °C | 91.69 mm |
| August | 13.3 °C | 25.2 °C | 100.08 mm |
| September | 8.8 °C | 21 °C | 98.04 mm |
| October | 2.2 °C | 13.3 °C | 73.66 mm |
| November | -4.1 °C | 4.8 °C | 45.72 mm |
| December | -10.9 °C | -2.3 °C | 33.78 mm |
| Annual | 0.6 °C | 11.5 °C | 823.97 mm |
| 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |