Greenleaf, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 12.5 °C (high). Annual precipitation averages 826 Millimeters. Greenleaf 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 | -11.9 °C | -3.6 °C | 35.81 mm |
| February | -10.8 °C | -1.7 °C | 28.96 mm |
| March | -5.3 °C | 4.4 °C | 45.21 mm |
| April | 1.1 °C | 11.9 °C | 79.25 mm |
| May | 7.6 °C | 19.1 °C | 91.95 mm |
| June | 13.3 °C | 24.4 °C | 112.27 mm |
| July | 15.7 °C | 27 °C | 95.5 mm |
| August | 14.9 °C | 25.9 °C | 88.65 mm |
| September | 10.4 °C | 22.1 °C | 83.82 mm |
| October | 4.1 °C | 14.4 °C | 73.66 mm |
| November | -2.1 °C | 6.5 °C | 49.02 mm |
| December | -8.1 °C | -0.4 °C | 41.91 mm |
| Annual | 2.4 °C | 12.5 °C | 826.01 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |