Cedar Grove, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.2 °C (low) to 12.5 °C (high). Annual precipitation averages 841 Millimeters. Cedar Grove 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 | -10.5 °C | -2.6 °C | 40.89 mm |
| February | -9.1 °C | -0.8 °C | 37.59 mm |
| March | -4.1 °C | 4.8 °C | 51.56 mm |
| April | 1.4 °C | 11.1 °C | 94.49 mm |
| May | 7 °C | 17.4 °C | 98.81 mm |
| June | 12.7 °C | 23.3 °C | 90.42 mm |
| July | 16.1 °C | 26.5 °C | 91.95 mm |
| August | 15.7 °C | 25.6 °C | 90.68 mm |
| September | 11.5 °C | 21.8 °C | 70.87 mm |
| October | 5.2 °C | 14.6 °C | 73.66 mm |
| November | -1.2 °C | 7.2 °C | 51.82 mm |
| December | -6.9 °C | 0.7 °C | 48.26 mm |
| Annual | 3.2 °C | 12.5 °C | 841 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |