Deer Park, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 53.1 °F (high). Annual precipitation averages 33.5 Inches. Deer Park is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °F | 21.8 °F | 0.96 in. |
| February | 6.7 °F | 26.9 °F | 0.94 in. |
| March | 19.3 °F | 39.3 °F | 1.65 in. |
| April | 32.4 °F | 53.6 °F | 2.97 in. |
| May | 45.0 °F | 66.5 °F | 3.96 in. |
| June | 55.3 °F | 75.9 °F | 4.88 in. |
| July | 59.4 °F | 80.2 °F | 4.42 in. |
| August | 57.1 °F | 78.4 °F | 4.25 in. |
| September | 49.0 °F | 70.7 °F | 3.46 in. |
| October | 36.5 °F | 56.3 °F | 2.94 in. |
| November | 24.4 °F | 40.6 °F | 1.76 in. |
| December | 11.4 °F | 27.0 °F | 1.33 in. |
| Annual | 33.4 °F | 53.1 °F | 33.52 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |