Boyd, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 11.8 °C (high). Annual precipitation averages 822.2 Millimeters. Boyd 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 | -15.7 °C | -5.4 °C | 24.64 mm |
| February | -14.1 °C | -2.7 °C | 24.38 mm |
| March | -7.1 °C | 4.2 °C | 41.91 mm |
| April | 0.1 °C | 12.2 °C | 76.2 mm |
| May | 6.8 °C | 19.3 °C | 98.04 mm |
| June | 12.4 °C | 24.3 °C | 115.82 mm |
| July | 14.7 °C | 26.7 °C | 99.31 mm |
| August | 13.3 °C | 25.6 °C | 105.66 mm |
| September | 8.7 °C | 21.2 °C | 87.88 mm |
| October | 2.2 °C | 13.7 °C | 68.07 mm |
| November | -4.4 °C | 4.8 °C | 47.24 mm |
| December | -11.3 °C | -2.4 °C | 33.02 mm |
| Annual | 0.5 °C | 11.8 °C | 822.17 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |