Clear Lake, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 11.5 °C (high). Annual precipitation averages 855.5 Millimeters. Clear Lake is located in USDA Plant Hardiness Zone 4b. 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 | -15.7 °C | -5.9 °C | 25.4 mm |
| February | -14.2 °C | -3.1 °C | 25.4 mm |
| March | -7.1 °C | 3.8 °C | 43.18 mm |
| April | 0.2 °C | 11.7 °C | 75.69 mm |
| May | 7.2 °C | 19.1 °C | 99.31 mm |
| June | 12.8 °C | 24.3 °C | 122.43 mm |
| July | 15.2 °C | 26.6 °C | 112.78 mm |
| August | 13.9 °C | 25.5 °C | 107.19 mm |
| September | 9.4 °C | 21.2 °C | 86.87 mm |
| October | 2.6 °C | 13.2 °C | 75.69 mm |
| November | -4.3 °C | 4.4 °C | 46.23 mm |
| December | -11.6 °C | -3.1 °C | 35.31 mm |
| Annual | 0.7 °C | 11.5 °C | 855.48 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |