Ashland, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.2 °F (low) to 51.8 °F (high). Annual precipitation averages 31.6 Inches. Ashland 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 | 5.8 °F | 22.9 °F | 1.35 in. |
| February | 7.7 °F | 27.0 °F | 1.1 in. |
| March | 17.7 °F | 37.3 °F | 1.66 in. |
| April | 29.3 °F | 49.0 °F | 2.94 in. |
| May | 39.6 °F | 62.7 °F | 3.74 in. |
| June | 50.3 °F | 73.1 °F | 3.75 in. |
| July | 56.4 °F | 78.7 °F | 4.25 in. |
| August | 55.3 °F | 77.5 °F | 3.37 in. |
| September | 48.1 °F | 69.8 °F | 3.06 in. |
| October | 36.5 °F | 55.1 °F | 3.07 in. |
| November | 26.1 °F | 40.7 °F | 1.71 in. |
| December | 13.8 °F | 28.1 °F | 1.64 in. |
| Annual | 32.2 °F | 51.8 °F | 31.64 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 |