Watford City, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.2 °C (low) to 12 °C (high). Annual precipitation averages 411.7 Millimeters. Watford 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.2 °C | -5.4 °C | 12.7 mm |
| February | -13.8 °C | -2.6 °C | 9.91 mm |
| March | -8.2 °C | 4 °C | 14.48 mm |
| April | -1.6 °C | 12.4 °C | 25.65 mm |
| May | 4.6 °C | 18.7 °C | 61.47 mm |
| June | 10.4 °C | 23.7 °C | 80.52 mm |
| July | 13.1 °C | 28.2 °C | 69.6 mm |
| August | 12.1 °C | 28.1 °C | 40.39 mm |
| September | 6.5 °C | 22.3 °C | 38.1 mm |
| October | -0.2 °C | 13.3 °C | 28.19 mm |
| November | -7.4 °C | 4.1 °C | 16 mm |
| December | -13.4 °C | -2.9 °C | 14.73 mm |
| Annual | -1.2 °C | 12 °C | 411.74 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |