Ashley, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 11.4 °C (high). Annual precipitation averages 528.8 Millimeters. 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 | -16.7 °C | -6.6 °C | 11.68 mm |
| February | -14.3 °C | -4.1 °C | 13.21 mm |
| March | -8.2 °C | 2.8 °C | 22.35 mm |
| April | -1.3 °C | 11.7 °C | 35.56 mm |
| May | 5.8 °C | 18.8 °C | 77.22 mm |
| June | 11.9 °C | 24.1 °C | 94.23 mm |
| July | 14.6 °C | 27.6 °C | 83.57 mm |
| August | 13.3 °C | 26.9 °C | 65.28 mm |
| September | 7.9 °C | 22 °C | 54.1 mm |
| October | 0.6 °C | 12.9 °C | 45.47 mm |
| November | -7.1 °C | 3.9 °C | 13.21 mm |
| December | -12.9 °C | -3.6 °C | 12.95 mm |
| Annual | -0.5 °C | 11.4 °C | 528.83 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |