Ashley, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31 °F (low) to 52.5 °F (high). Annual precipitation averages 20.8 Inches. Ashley is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.0 °F | 20.2 °F | 0.46 in. |
| February | 6.2 °F | 24.7 °F | 0.52 in. |
| March | 17.2 °F | 37.0 °F | 0.88 in. |
| April | 29.7 °F | 53.1 °F | 1.4 in. |
| May | 42.4 °F | 65.8 °F | 3.04 in. |
| June | 53.5 °F | 75.3 °F | 3.71 in. |
| July | 58.2 °F | 81.6 °F | 3.29 in. |
| August | 55.9 °F | 80.4 °F | 2.57 in. |
| September | 46.3 °F | 71.6 °F | 2.13 in. |
| October | 33.1 °F | 55.2 °F | 1.79 in. |
| November | 19.3 °F | 39.1 °F | 0.52 in. |
| December | 8.7 °F | 25.5 °F | 0.51 in. |
| Annual | 31 °F | 52.5 °F | 20.82 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |