Star Prairie, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12.2 °C (high). Annual precipitation averages 844 Millimeters. Star Prairie 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 | -15.2 °C | -5.2 °C | 23.37 mm |
| February | -13.6 °C | -2.3 °C | 22.61 mm |
| March | -6.7 °C | 4.6 °C | 39.88 mm |
| April | 0.6 °C | 12.5 °C | 75.69 mm |
| May | 7.7 °C | 19.6 °C | 101.35 mm |
| June | 13.4 °C | 24.8 °C | 123.44 mm |
| July | 15.7 °C | 27.3 °C | 112.52 mm |
| August | 14.4 °C | 26.3 °C | 107.44 mm |
| September | 9.9 °C | 22.1 °C | 88.65 mm |
| October | 2.9 °C | 14.1 °C | 74.42 mm |
| November | -3.9 °C | 5.3 °C | 42.67 mm |
| December | -11 °C | -2.3 °C | 32 mm |
| Annual | 1.2 °C | 12.2 °C | 844.04 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |