Osceola, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.2 °F (low) to 54.9 °F (high). Annual precipitation averages 32.1 Inches. 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 | 4.3 °F | 23.4 °F | 0.91 in. |
| February | 7.6 °F | 28.6 °F | 0.93 in. |
| March | 20.0 °F | 41.0 °F | 1.4 in. |
| April | 33.2 °F | 55.7 °F | 2.9 in. |
| May | 46.0 °F | 68.5 °F | 3.98 in. |
| June | 56.2 °F | 78.0 °F | 4.45 in. |
| July | 60.7 °F | 82.1 °F | 4.34 in. |
| August | 58.2 °F | 80.1 °F | 4.04 in. |
| September | 50.0 °F | 72.5 °F | 3.45 in. |
| October | 37.4 °F | 58.3 °F | 2.89 in. |
| November | 25.0 °F | 42.3 °F | 1.67 in. |
| December | 12.2 °F | 28.6 °F | 1.17 in. |
| Annual | 34.2 °F | 54.9 °F | 32.13 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 |