Turtle 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 11.2 °C (high). Annual precipitation averages 844.8 Millimeters. Turtle 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 | -15.6 °C | -6.2 °C | 24.13 mm |
| February | -14.1 °C | -3.3 °C | 24.38 mm |
| March | -7.2 °C | 3.6 °C | 42.67 mm |
| April | 0.2 °C | 11.4 °C | 74.68 mm |
| May | 7.1 °C | 18.9 °C | 99.57 mm |
| June | 12.6 °C | 23.9 °C | 116.59 mm |
| July | 14.9 °C | 26.3 °C | 108.97 mm |
| August | 13.7 °C | 25.3 °C | 108.2 mm |
| September | 9.2 °C | 20.8 °C | 89.41 mm |
| October | 2.7 °C | 12.9 °C | 77.98 mm |
| November | -4.2 °C | 4.2 °C | 45.21 mm |
| December | -11.4 °C | -3.3 °C | 33.02 mm |
| Annual | 0.7 °C | 11.2 °C | 844.81 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |