Somerset, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.1 °F (low) to 54.7 °F (high). Annual precipitation averages 33.9 Inches. 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 | 5.6 °F | 23.3 °F | 0.91 in. |
| February | 8.7 °F | 28.4 °F | 0.86 in. |
| March | 20.9 °F | 40.7 °F | 1.58 in. |
| April | 34.1 °F | 55.3 °F | 3.07 in. |
| May | 46.7 °F | 67.8 °F | 4.15 in. |
| June | 57.1 °F | 77.5 °F | 5.03 in. |
| July | 61.5 °F | 81.9 °F | 4.43 in. |
| August | 59.0 °F | 79.9 °F | 4.5 in. |
| September | 50.8 °F | 72.3 °F | 3.51 in. |
| October | 38.1 °F | 58.1 °F | 2.94 in. |
| November | 25.7 °F | 42.2 °F | 1.67 in. |
| December | 13.1 °F | 28.5 °F | 1.24 in. |
| Annual | 35.1 °F | 54.7 °F | 33.89 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |