Chetek, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 53.2 °F (high). Annual precipitation averages 32.9 Inches. 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 | 3.8 °F | 22.2 °F | 0.99 in. |
| February | 6.6 °F | 27.0 °F | 0.96 in. |
| March | 18.8 °F | 39.4 °F | 1.7 in. |
| April | 32.1 °F | 53.9 °F | 2.91 in. |
| May | 44.6 °F | 66.7 °F | 3.98 in. |
| June | 54.8 °F | 75.8 °F | 4.44 in. |
| July | 58.9 °F | 80.3 °F | 4.02 in. |
| August | 56.5 °F | 78.4 °F | 4.18 in. |
| September | 48.2 °F | 70.6 °F | 3.62 in. |
| October | 36.1 °F | 56.3 °F | 3.04 in. |
| November | 24.2 °F | 40.6 °F | 1.77 in. |
| December | 11.6 °F | 27.4 °F | 1.33 in. |
| Annual | 33 °F | 53.2 °F | 32.94 in. |
| 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 : -25°F to -20°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 |