Ashby, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.7 °F (low) to 52.2 °F (high). Annual precipitation averages 25.9 Inches. Ashby is located in USDA Plant Hardiness Zone 4a. 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 | 1.0 °F | 19.0 °F | 0.71 in. |
| February | 4.6 °F | 24.0 °F | 0.61 in. |
| March | 17.8 °F | 36.8 °F | 1.07 in. |
| April | 31.9 °F | 53.1 °F | 2.09 in. |
| May | 45.5 °F | 66.8 °F | 3.24 in. |
| June | 56.2 °F | 76.3 °F | 4.41 in. |
| July | 60.7 °F | 80.6 °F | 3.71 in. |
| August | 58.1 °F | 78.9 °F | 3.24 in. |
| September | 49.5 °F | 71.5 °F | 2.66 in. |
| October | 36.2 °F | 55.7 °F | 2.49 in. |
| November | 22.2 °F | 38.5 °F | 0.9 in. |
| December | 8.8 °F | 25.0 °F | 0.75 in. |
| Annual | 32.7 °F | 52.2 °F | 25.88 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 4a : -30°F to -25°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 |