Kiel, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 12.7 °C (high). Annual precipitation averages 842.8 Millimeters. Kiel 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.9 °C | -3.6 °C | 39.12 mm |
| February | -10.7 °C | -1.6 °C | 33.27 mm |
| March | -5.1 °C | 5.2 °C | 47.75 mm |
| April | 1.2 °C | 12.1 °C | 84.33 mm |
| May | 7.6 °C | 18.9 °C | 97.03 mm |
| June | 13.6 °C | 24.5 °C | 108.2 mm |
| July | 15.7 °C | 27.1 °C | 95.25 mm |
| August | 14.9 °C | 26.1 °C | 90.42 mm |
| September | 10.5 °C | 22.3 °C | 77.47 mm |
| October | 4.1 °C | 14.7 °C | 74.17 mm |
| November | -2.1 °C | 6.8 °C | 51.82 mm |
| December | -8.1 °C | -0.4 °C | 43.94 mm |
| Annual | 2.5 °C | 12.7 °C | 842.77 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |