Somerset, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 12.6 °C (high). Annual precipitation averages 860.8 Millimeters. Somerset 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 | -14.7 °C | -4.8 °C | 23.11 mm |
| February | -12.9 °C | -2 °C | 21.84 mm |
| March | -6.2 °C | 4.8 °C | 40.13 mm |
| April | 1.2 °C | 12.9 °C | 77.98 mm |
| May | 8.2 °C | 19.9 °C | 105.41 mm |
| June | 13.9 °C | 25.3 °C | 127.76 mm |
| July | 16.4 °C | 27.7 °C | 112.52 mm |
| August | 15 °C | 26.6 °C | 114.3 mm |
| September | 10.4 °C | 22.4 °C | 89.15 mm |
| October | 3.4 °C | 14.5 °C | 74.68 mm |
| November | -3.5 °C | 5.7 °C | 42.42 mm |
| December | -10.5 °C | -1.9 °C | 31.5 mm |
| Annual | 1.7 °C | 12.6 °C | 860.8 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 |