Green Lake, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.3 °F (low) to 55.4 °F (high). Annual precipitation averages 34.1 Inches. 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 | 9.7 °F | 26.0 °F | 1.34 in. |
| February | 12.0 °F | 29.8 °F | 1.23 in. |
| March | 22.7 °F | 41.4 °F | 1.89 in. |
| April | 34.5 °F | 55.2 °F | 3.45 in. |
| May | 46.7 °F | 67.5 °F | 4.04 in. |
| June | 56.7 °F | 77.3 °F | 4.93 in. |
| July | 60.8 °F | 81.5 °F | 3.98 in. |
| August | 58.9 °F | 79.6 °F | 3.64 in. |
| September | 50.7 °F | 72.4 °F | 3.22 in. |
| October | 38.9 °F | 58.9 °F | 2.78 in. |
| November | 27.6 °F | 44.3 °F | 1.97 in. |
| December | 16.6 °F | 31.4 °F | 1.59 in. |
| Annual | 36.3 °F | 55.4 °F | 34.06 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |