Washburn, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32 °F (low) to 51.1 °F (high). Annual precipitation averages 31.8 Inches. Washburn is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.9 °F | 22.9 °F | 1.38 in. |
| February | 7.3 °F | 27.0 °F | 1.1 in. |
| March | 17.1 °F | 37.0 °F | 1.71 in. |
| April | 29.4 °F | 48.4 °F | 2.97 in. |
| May | 39.3 °F | 61.1 °F | 3.66 in. |
| June | 49.5 °F | 71.6 °F | 3.72 in. |
| July | 56.1 °F | 77.6 °F | 4.15 in. |
| August | 55.1 °F | 76.3 °F | 3.37 in. |
| September | 47.9 °F | 68.8 °F | 3.12 in. |
| October | 36.5 °F | 54.4 °F | 3.09 in. |
| November | 26.2 °F | 40.1 °F | 1.85 in. |
| December | 14.1 °F | 28.2 °F | 1.69 in. |
| Annual | 32 °F | 51.1 °F | 31.81 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |