Cornell, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.9 °F (low) to 53.3 °F (high). Annual precipitation averages 31.6 Inches. Cornell is located in USDA Plant Hardiness Zone 4b. 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 | 3.8 °F | 22.6 °F | 1.01 in. |
| February | 6.5 °F | 27.5 °F | 0.96 in. |
| March | 18.9 °F | 39.6 °F | 1.56 in. |
| April | 32.1 °F | 53.8 °F | 2.79 in. |
| May | 44.3 °F | 67.1 °F | 3.69 in. |
| June | 54.2 °F | 75.8 °F | 4.45 in. |
| July | 58.4 °F | 80.0 °F | 3.75 in. |
| August | 56.0 °F | 78.1 °F | 4.05 in. |
| September | 47.9 °F | 70.4 °F | 3.49 in. |
| October | 36.3 °F | 56.6 °F | 2.95 in. |
| November | 24.4 °F | 40.6 °F | 1.72 in. |
| December | 11.9 °F | 27.9 °F | 1.21 in. |
| Annual | 32.9 °F | 53.3 °F | 31.63 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |