Chetek, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 11.8 °C (high). Annual precipitation averages 836.7 Millimeters. Chetek 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.7 °C | -5.4 °C | 25.15 mm |
| February | -14.1 °C | -2.8 °C | 24.38 mm |
| March | -7.3 °C | 4.1 °C | 43.18 mm |
| April | 0.1 °C | 12.2 °C | 73.91 mm |
| May | 7 °C | 19.3 °C | 101.09 mm |
| June | 12.7 °C | 24.3 °C | 112.78 mm |
| July | 14.9 °C | 26.8 °C | 102.11 mm |
| August | 13.6 °C | 25.8 °C | 106.17 mm |
| September | 9 °C | 21.4 °C | 91.95 mm |
| October | 2.3 °C | 13.5 °C | 77.22 mm |
| November | -4.3 °C | 4.8 °C | 44.96 mm |
| December | -11.3 °C | -2.6 °C | 33.78 mm |
| Annual | 0.6 °C | 11.8 °C | 836.68 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |