Whittlesey, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31 °F (low) to 51.6 °F (high). Annual precipitation averages 33.3 Inches. Whittlesey is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °F | 21.1 °F | 1.11 in. |
| February | 4.4 °F | 26.0 °F | 1.04 in. |
| March | 16.1 °F | 37.7 °F | 1.66 in. |
| April | 29.5 °F | 51.7 °F | 2.92 in. |
| May | 42.4 °F | 65.2 °F | 3.69 in. |
| June | 52.4 °F | 74.1 °F | 4.69 in. |
| July | 56.2 °F | 78.4 °F | 3.81 in. |
| August | 53.9 °F | 76.3 °F | 4.06 in. |
| September | 46.3 °F | 68.8 °F | 3.86 in. |
| October | 34.4 °F | 54.7 °F | 3.11 in. |
| November | 23.3 °F | 39.1 °F | 1.87 in. |
| December | 10.6 °F | 26.4 °F | 1.45 in. |
| Annual | 31 °F | 51.6 °F | 33.27 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°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 |