Kewaskum, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.5 °C (low) to 12.9 °C (high). Annual precipitation averages 881.6 Millimeters. Kewaskum 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 | -11.7 °C | -3 °C | 40.64 mm |
| February | -10.2 °C | -1 °C | 35.81 mm |
| March | -4.8 °C | 5.3 °C | 50.04 mm |
| April | 1.3 °C | 12.4 °C | 92.71 mm |
| May | 7.4 °C | 19.2 °C | 97.28 mm |
| June | 12.9 °C | 24.7 °C | 108.71 mm |
| July | 15.7 °C | 27.2 °C | 103.12 mm |
| August | 14.7 °C | 26.1 °C | 100.33 mm |
| September | 10.3 °C | 22.3 °C | 83.57 mm |
| October | 4.1 °C | 15 °C | 73.41 mm |
| November | -2.2 °C | 6.9 °C | 50.8 mm |
| December | -7.9 °C | 0.2 °C | 45.21 mm |
| Annual | 2.5 °C | 12.9 °C | 881.63 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |