Lake Geneva, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38 °F (low) to 57.5 °F (high). Annual precipitation averages 37.8 Inches. Lake Geneva 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 | 13.2 °F | 28.8 °F | 1.89 in. |
| February | 16.0 °F | 32.7 °F | 1.85 in. |
| March | 25.3 °F | 44.2 °F | 2.19 in. |
| April | 35.7 °F | 57.2 °F | 3.77 in. |
| May | 47.1 °F | 68.8 °F | 4.29 in. |
| June | 56.9 °F | 78.7 °F | 5.07 in. |
| July | 61.3 °F | 82.5 °F | 3.68 in. |
| August | 59.5 °F | 81.0 °F | 3.86 in. |
| September | 51.7 °F | 74.4 °F | 3.6 in. |
| October | 40.3 °F | 61.1 °F | 2.99 in. |
| November | 29.6 °F | 46.6 °F | 2.46 in. |
| December | 19.3 °F | 34.0 °F | 2.11 in. |
| Annual | 38 °F | 57.5 °F | 37.76 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |