Mukwonago, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.6 °F (low) to 56.8 °F (high). Annual precipitation averages 36.2 Inches. Mukwonago is located in USDA Plant Hardiness Zone 5b. 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 | 12.4 °F | 28.3 °F | 1.72 in. |
| February | 15.3 °F | 32.0 °F | 1.68 in. |
| March | 24.6 °F | 43.2 °F | 2.06 in. |
| April | 35.5 °F | 56.0 °F | 3.77 in. |
| May | 46.5 °F | 67.7 °F | 4.13 in. |
| June | 56.5 °F | 77.8 °F | 4.7 in. |
| July | 61.1 °F | 82.0 °F | 3.85 in. |
| August | 59.5 °F | 80.4 °F | 3.72 in. |
| September | 51.3 °F | 73.7 °F | 3.32 in. |
| October | 40.1 °F | 60.4 °F | 3.0 in. |
| November | 29.1 °F | 46.0 °F | 2.25 in. |
| December | 18.8 °F | 33.6 °F | 1.98 in. |
| Annual | 37.6 °F | 56.8 °F | 36.18 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 5b : -15°F to -10°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 |