Ashippun, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.9 °F (low) to 56.1 °F (high). Annual precipitation averages 35.7 Inches. 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 | 10.9 °F | 27.0 °F | 1.59 in. |
| February | 13.5 °F | 30.6 °F | 1.5 in. |
| March | 23.9 °F | 42.4 °F | 1.97 in. |
| April | 35.2 °F | 55.8 °F | 3.68 in. |
| May | 46.5 °F | 67.8 °F | 4.02 in. |
| June | 56.5 °F | 77.6 °F | 4.86 in. |
| July | 60.8 °F | 81.6 °F | 4.09 in. |
| August | 58.9 °F | 79.8 °F | 3.95 in. |
| September | 50.9 °F | 73.2 °F | 3.27 in. |
| October | 39.6 °F | 59.9 °F | 2.89 in. |
| November | 28.4 °F | 45.3 °F | 2.1 in. |
| December | 17.7 °F | 32.6 °F | 1.8 in. |
| Annual | 36.9 °F | 56.1 °F | 35.72 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |