Green Lake, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 13 °C (high). Annual precipitation averages 865.1 Millimeters. Green Lake is located in USDA Plant Hardiness Zone 5a. 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 | -12.4 °C | -3.3 °C | 34.04 mm |
| February | -11.1 °C | -1.2 °C | 31.24 mm |
| March | -5.2 °C | 5.2 °C | 48.01 mm |
| April | 1.4 °C | 12.9 °C | 87.63 mm |
| May | 8.2 °C | 19.7 °C | 102.62 mm |
| June | 13.7 °C | 25.2 °C | 125.22 mm |
| July | 16 °C | 27.5 °C | 101.09 mm |
| August | 14.9 °C | 26.4 °C | 92.46 mm |
| September | 10.4 °C | 22.4 °C | 81.79 mm |
| October | 3.8 °C | 14.9 °C | 70.61 mm |
| November | -2.4 °C | 6.8 °C | 50.04 mm |
| December | -8.6 °C | -0.3 °C | 40.39 mm |
| Annual | 2.4 °C | 13 °C | 865.14 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |