Cashton, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.7 °C (low) to 12.3 °C (high). Annual precipitation averages 931.7 Millimeters. 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 | -12.7 °C | -4.7 °C | 29.46 mm |
| February | -10.7 °C | -2 °C | 27.18 mm |
| March | -4.7 °C | 4.9 °C | 42.67 mm |
| April | 2.1 °C | 13.1 °C | 94.74 mm |
| May | 8.7 °C | 19.7 °C | 121.67 mm |
| June | 14.2 °C | 24.5 °C | 134.62 mm |
| July | 16.5 °C | 26.9 °C | 109.47 mm |
| August | 15.4 °C | 25.8 °C | 112.52 mm |
| September | 10.9 °C | 21.6 °C | 98.55 mm |
| October | 4.4 °C | 14.2 °C | 73.66 mm |
| November | -2.7 °C | 5.4 °C | 49.28 mm |
| December | -8.9 °C | -1.6 °C | 37.85 mm |
| Annual | 2.7 °C | 12.3 °C | 931.67 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |