Cedarburg, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 12.9 °C (high). Annual precipitation averages 995.4 Millimeters. Cedarburg 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 | -10.6 °C | -2.3 °C | 50.8 mm |
| February | -9.2 °C | -0.3 °C | 42.16 mm |
| March | -4.2 °C | 5.5 °C | 59.69 mm |
| April | 1.5 °C | 11.7 °C | 110.49 mm |
| May | 7.4 °C | 18.6 °C | 112.27 mm |
| June | 12.9 °C | 23.9 °C | 108.46 mm |
| July | 16 °C | 26.7 °C | 110.49 mm |
| August | 15.3 °C | 25.8 °C | 110.49 mm |
| September | 11 °C | 21.8 °C | 94.74 mm |
| October | 4.7 °C | 14.9 °C | 80.77 mm |
| November | -1.6 °C | 7.5 °C | 56.39 mm |
| December | -7 °C | 0.9 °C | 58.67 mm |
| Annual | 3 °C | 12.9 °C | 995.42 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |