Gays Mills, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 13.8 °C (high). Annual precipitation averages 941.1 Millimeters. Gays Mills 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 | -13.4 °C | -2.9 °C | 32.77 mm |
| February | -11.4 °C | -0.3 °C | 29.72 mm |
| March | -5.2 °C | 6.4 °C | 50.04 mm |
| April | 1.4 °C | 14.2 °C | 100.33 mm |
| May | 7.7 °C | 20.8 °C | 108.97 mm |
| June | 13.6 °C | 26.1 °C | 143.51 mm |
| July | 15.8 °C | 28.1 °C | 117.09 mm |
| August | 14.7 °C | 27.1 °C | 99.82 mm |
| September | 9.7 °C | 23 °C | 96.52 mm |
| October | 3 °C | 15.8 °C | 70.61 mm |
| November | -3.4 °C | 7.1 °C | 51.56 mm |
| December | -9.5 °C | 0 °C | 40.13 mm |
| Annual | 1.9 °C | 13.8 °C | 941.07 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |