Chilton, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.4 °F (low) to 54.8 °F (high). Annual precipitation averages 33.4 Inches. Chilton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.2 °F | 25.2 °F | 1.48 in. |
| February | 12.3 °F | 28.8 °F | 1.24 in. |
| March | 22.7 °F | 40.4 °F | 1.86 in. |
| April | 34.2 °F | 54.0 °F | 3.08 in. |
| May | 46.0 °F | 66.8 °F | 3.82 in. |
| June | 56.3 °F | 76.6 °F | 4.54 in. |
| July | 60.6 °F | 81.1 °F | 3.87 in. |
| August | 58.7 °F | 79.2 °F | 3.57 in. |
| September | 50.8 °F | 72.1 °F | 3.26 in. |
| October | 39.2 °F | 58.4 °F | 2.93 in. |
| November | 28.1 °F | 43.7 °F | 2.05 in. |
| December | 17.1 °F | 30.9 °F | 1.66 in. |
| Annual | 36.4 °F | 54.8 °F | 33.36 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |