Cashton, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.9 °F (low) to 54.2 °F (high). Annual precipitation averages 36.7 Inches. Cashton is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.1 °F | 23.6 °F | 1.16 in. |
| February | 12.8 °F | 28.4 °F | 1.07 in. |
| March | 23.6 °F | 40.9 °F | 1.68 in. |
| April | 35.8 °F | 55.6 °F | 3.73 in. |
| May | 47.6 °F | 67.4 °F | 4.79 in. |
| June | 57.6 °F | 76.1 °F | 5.3 in. |
| July | 61.7 °F | 80.4 °F | 4.31 in. |
| August | 59.7 °F | 78.4 °F | 4.43 in. |
| September | 51.6 °F | 70.8 °F | 3.88 in. |
| October | 39.9 °F | 57.5 °F | 2.9 in. |
| November | 27.1 °F | 41.7 °F | 1.94 in. |
| December | 16.0 °F | 29.1 °F | 1.49 in. |
| Annual | 36.9 °F | 54.2 °F | 36.68 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°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 |