Valley City, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.3 °C (low) to 10.9 °C (high). Annual precipitation averages 547.9 Millimeters. Valley City 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.7 °C | -8.1 °C | 13.21 mm |
| February | -16.5 °C | -5.3 °C | 12.95 mm |
| March | -9.4 °C | 1.7 °C | 20.83 mm |
| April | -1.6 °C | 11.2 °C | 30.99 mm |
| May | 5.7 °C | 19.3 °C | 78.49 mm |
| June | 12.1 °C | 24.6 °C | 101.09 mm |
| July | 14.3 °C | 27.4 °C | 80.52 mm |
| August | 12.7 °C | 26.8 °C | 69.09 mm |
| September | 7.5 °C | 21.8 °C | 60.96 mm |
| October | 0.4 °C | 13 °C | 45.72 mm |
| November | -7.3 °C | 3.2 °C | 16.26 mm |
| December | -14.2 °C | -4.8 °C | 17.78 mm |
| Annual | -1.3 °C | 10.9 °C | 547.89 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°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 |