Clam Lake, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.6 °F (low) to 51 °F (high). Annual precipitation averages 34.3 Inches. Clam Lake is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.8 °F | 20.4 °F | 1.15 in. |
| February | 3.0 °F | 26.1 °F | 1.05 in. |
| March | 14.3 °F | 37.8 °F | 1.86 in. |
| April | 27.7 °F | 50.8 °F | 3.04 in. |
| May | 40.2 °F | 64.4 °F | 4.04 in. |
| June | 50.3 °F | 73.6 °F | 4.37 in. |
| July | 55.1 °F | 77.7 °F | 4.1 in. |
| August | 52.7 °F | 75.8 °F | 3.85 in. |
| September | 45.5 °F | 68.2 °F | 3.94 in. |
| October | 33.9 °F | 53.7 °F | 3.49 in. |
| November | 21.9 °F | 38.4 °F | 1.92 in. |
| December | 9.3 °F | 25.6 °F | 1.51 in. |
| Annual | 29.6 °F | 51 °F | 34.32 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |