Ashippun, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.7 °C (low) to 13.4 °C (high). Annual precipitation averages 907.3 Millimeters. Ashippun is located in USDA Plant Hardiness Zone 5a. 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 | -11.7 °C | -2.8 °C | 40.39 mm |
| February | -10.3 °C | -0.8 °C | 38.1 mm |
| March | -4.5 °C | 5.8 °C | 50.04 mm |
| April | 1.8 °C | 13.2 °C | 93.47 mm |
| May | 8.1 °C | 19.9 °C | 102.11 mm |
| June | 13.6 °C | 25.3 °C | 123.44 mm |
| July | 16 °C | 27.6 °C | 103.89 mm |
| August | 14.9 °C | 26.6 °C | 100.33 mm |
| September | 10.5 °C | 22.9 °C | 83.06 mm |
| October | 4.2 °C | 15.5 °C | 73.41 mm |
| November | -2 °C | 7.4 °C | 53.34 mm |
| December | -7.9 °C | 0.3 °C | 45.72 mm |
| Annual | 2.7 °C | 13.4 °C | 907.3 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |