Mukwonago, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 13.8 °C (high). Annual precipitation averages 919 Millimeters. 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 | -10.9 °C | -2.1 °C | 43.69 mm |
| February | -9.3 °C | 0 °C | 42.67 mm |
| March | -4.1 °C | 6.2 °C | 52.32 mm |
| April | 1.9 °C | 13.3 °C | 95.76 mm |
| May | 8.1 °C | 19.8 °C | 104.9 mm |
| June | 13.6 °C | 25.4 °C | 119.38 mm |
| July | 16.2 °C | 27.8 °C | 97.79 mm |
| August | 15.3 °C | 26.9 °C | 94.49 mm |
| September | 10.7 °C | 23.2 °C | 84.33 mm |
| October | 4.5 °C | 15.8 °C | 76.2 mm |
| November | -1.6 °C | 7.8 °C | 57.15 mm |
| December | -7.3 °C | 0.9 °C | 50.29 mm |
| Annual | 3.1 °C | 13.8 °C | 918.97 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |