Cecil, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.2 °F (low) to 54.9 °F (high). Annual precipitation averages 33.5 Inches. Cecil is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.8 °F | 25.1 °F | 1.37 in. |
| February | 9.3 °F | 29.1 °F | 1.16 in. |
| March | 20.0 °F | 40.6 °F | 1.81 in. |
| April | 32.3 °F | 54.8 °F | 3.24 in. |
| May | 44.4 °F | 67.6 °F | 3.71 in. |
| June | 54.4 °F | 77.1 °F | 4.57 in. |
| July | 58.6 °F | 81.5 °F | 3.82 in. |
| August | 56.6 °F | 79.6 °F | 3.63 in. |
| September | 48.3 °F | 72.0 °F | 3.59 in. |
| October | 36.9 °F | 58.2 °F | 3.03 in. |
| November | 26.4 °F | 43.2 °F | 1.91 in. |
| December | 15.0 °F | 30.2 °F | 1.67 in. |
| Annual | 34.2 °F | 54.9 °F | 33.51 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |