Bayfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.1 °F (low) to 50.5 °F (high). Annual precipitation averages 31.6 Inches. 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 | 6.6 °F | 23.0 °F | 1.56 in. |
| February | 7.8 °F | 26.8 °F | 1.16 in. |
| March | 16.9 °F | 36.3 °F | 1.77 in. |
| April | 29.1 °F | 47.4 °F | 2.98 in. |
| May | 38.7 °F | 60.1 °F | 3.39 in. |
| June | 48.5 °F | 70.2 °F | 3.62 in. |
| July | 55.7 °F | 76.6 °F | 3.85 in. |
| August | 55.3 °F | 75.4 °F | 3.2 in. |
| September | 48.2 °F | 68.1 °F | 3.14 in. |
| October | 37.0 °F | 53.9 °F | 3.06 in. |
| November | 26.6 °F | 40.0 °F | 2.16 in. |
| December | 14.7 °F | 28.4 °F | 1.75 in. |
| Annual | 32.1 °F | 50.5 °F | 31.64 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |