Bayfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 10.3 °C (high). Annual precipitation averages 803.7 Millimeters. Bayfield is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.1 °C | -5 °C | 39.62 mm |
| February | -13.4 °C | -2.9 °C | 29.46 mm |
| March | -8.4 °C | 2.4 °C | 44.96 mm |
| April | -1.6 °C | 8.6 °C | 75.69 mm |
| May | 3.7 °C | 15.6 °C | 86.11 mm |
| June | 9.2 °C | 21.2 °C | 91.95 mm |
| July | 13.2 °C | 24.8 °C | 97.79 mm |
| August | 12.9 °C | 24.1 °C | 81.28 mm |
| September | 9 °C | 20.1 °C | 79.76 mm |
| October | 2.8 °C | 12.2 °C | 77.72 mm |
| November | -3 °C | 4.4 °C | 54.86 mm |
| December | -9.6 °C | -2 °C | 44.45 mm |
| Annual | 0.1 °C | 10.3 °C | 803.65 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |