Cudahy, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.8 °C (low) to 13.3 °C (high). Annual precipitation averages 912.6 Millimeters. Cudahy is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | -1.1 °C | 45.97 mm |
| February | -7.3 °C | 0.7 °C | 43.43 mm |
| March | -2.6 °C | 6 °C | 54.1 mm |
| April | 2.8 °C | 11.4 °C | 106.17 mm |
| May | 8.6 °C | 17.8 °C | 102.36 mm |
| June | 14.4 °C | 23.5 °C | 113.03 mm |
| July | 18.1 °C | 26.6 °C | 86.87 mm |
| August | 17.9 °C | 26.1 °C | 92.96 mm |
| September | 13.4 °C | 22.3 °C | 81.03 mm |
| October | 6.7 °C | 15.6 °C | 77.72 mm |
| November | 0.3 °C | 8.5 °C | 58.42 mm |
| December | -5.4 °C | 1.8 °C | 50.55 mm |
| Annual | 4.8 °C | 13.3 °C | 912.61 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |