Osceola, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12.7 °C (high). Annual precipitation averages 816.1 Millimeters. Osceola 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 | -15.4 °C | -4.8 °C | 23.11 mm |
| February | -13.6 °C | -1.9 °C | 23.62 mm |
| March | -6.7 °C | 5 °C | 35.56 mm |
| April | 0.7 °C | 13.2 °C | 73.66 mm |
| May | 7.8 °C | 20.3 °C | 101.09 mm |
| June | 13.4 °C | 25.6 °C | 113.03 mm |
| July | 15.9 °C | 27.8 °C | 110.24 mm |
| August | 14.6 °C | 26.7 °C | 102.62 mm |
| September | 10 °C | 22.5 °C | 87.63 mm |
| October | 3 °C | 14.6 °C | 73.41 mm |
| November | -3.9 °C | 5.7 °C | 42.42 mm |
| December | -11 °C | -1.9 °C | 29.72 mm |
| Annual | 1.2 °C | 12.7 °C | 816.11 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 |