Clayton, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 52.5 °F (high). Annual precipitation averages 33.4 Inches. Clayton 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 | 3.6 °F | 21.1 °F | 0.97 in. |
| February | 6.5 °F | 26.2 °F | 0.97 in. |
| March | 19.1 °F | 38.7 °F | 1.7 in. |
| April | 32.3 °F | 53.0 °F | 2.96 in. |
| May | 45.0 °F | 66.3 °F | 3.93 in. |
| June | 55.1 °F | 75.5 °F | 4.67 in. |
| July | 59.3 °F | 79.8 °F | 4.32 in. |
| August | 57.0 °F | 77.8 °F | 4.26 in. |
| September | 48.9 °F | 70.0 °F | 3.48 in. |
| October | 36.7 °F | 55.6 °F | 3.02 in. |
| November | 24.3 °F | 39.8 °F | 1.79 in. |
| December | 11.2 °F | 26.4 °F | 1.33 in. |
| Annual | 33.3 °F | 52.5 °F | 33.4 in. |
| 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 : -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 |