Ashland, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 11 °C (high). Annual precipitation averages 803.7 Millimeters. 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 | -14.6 °C | -5.1 °C | 34.29 mm |
| February | -13.5 °C | -2.8 °C | 27.94 mm |
| March | -7.9 °C | 2.9 °C | 42.16 mm |
| April | -1.5 °C | 9.4 °C | 74.68 mm |
| May | 4.2 °C | 17.1 °C | 95 mm |
| June | 10.2 °C | 22.8 °C | 95.25 mm |
| July | 13.6 °C | 25.9 °C | 107.95 mm |
| August | 12.9 °C | 25.3 °C | 85.6 mm |
| September | 8.9 °C | 21 °C | 77.72 mm |
| October | 2.5 °C | 12.8 °C | 77.98 mm |
| November | -3.3 °C | 4.8 °C | 43.43 mm |
| December | -10.1 °C | -2.2 °C | 41.66 mm |
| Annual | 0.1 °C | 11 °C | 803.66 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |