Greenbush, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 12.8 °C (high). Annual precipitation averages 854.7 Millimeters. Greenbush is located in USDA Plant Hardiness Zone 5b. 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 | -11.8 °C | -3.2 °C | 40.64 mm |
| February | -10.1 °C | -1.1 °C | 35.31 mm |
| March | -4.7 °C | 5.4 °C | 49.28 mm |
| April | 1.3 °C | 12.1 °C | 89.66 mm |
| May | 7.7 °C | 18.8 °C | 99.57 mm |
| June | 13.2 °C | 24.4 °C | 105.41 mm |
| July | 15.9 °C | 27.1 °C | 94.74 mm |
| August | 14.9 °C | 25.9 °C | 92.46 mm |
| September | 10.4 °C | 22.2 °C | 74.93 mm |
| October | 4.1 °C | 14.7 °C | 74.93 mm |
| November | -2 °C | 6.8 °C | 52.32 mm |
| December | -7.8 °C | -0.1 °C | 45.47 mm |
| Annual | 2.6 °C | 12.8 °C | 854.72 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |