Pepin, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 13.3 °C (high). Annual precipitation averages 894.1 Millimeters. Pepin 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 | -13.8 °C | -4.1 °C | 24.89 mm |
| February | -11.9 °C | -1.3 °C | 27.69 mm |
| March | -5.1 °C | 5.5 °C | 46.48 mm |
| April | 1.9 °C | 13.7 °C | 82.3 mm |
| May | 8.7 °C | 20.7 °C | 116.84 mm |
| June | 14.4 °C | 26 °C | 131.57 mm |
| July | 16.7 °C | 28.2 °C | 107.95 mm |
| August | 15.4 °C | 27.1 °C | 115.32 mm |
| September | 10.9 °C | 22.9 °C | 98.81 mm |
| October | 3.9 °C | 15.2 °C | 65.53 mm |
| November | -2.9 °C | 6.3 °C | 43.69 mm |
| December | -9.6 °C | -1.1 °C | 33.02 mm |
| Annual | 2.4 °C | 13.3 °C | 894.09 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |