Westhope, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.5 °C (low) to 10.1 °C (high). Annual precipitation averages 475.5 Millimeters. Westhope is located in USDA Plant Hardiness Zone 3b. 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 | -19.9 °C | -9.3 °C | 14.48 mm |
| February | -17.6 °C | -6.6 °C | 14.48 mm |
| March | -10.5 °C | 0.3 °C | 21.34 mm |
| April | -2.1 °C | 11.4 °C | 25.4 mm |
| May | 4.7 °C | 19.2 °C | 63.5 mm |
| June | 10.8 °C | 23.9 °C | 98.3 mm |
| July | 13.1 °C | 26.7 °C | 67.06 mm |
| August | 11.7 °C | 26.9 °C | 53.85 mm |
| September | 6.4 °C | 21.7 °C | 40.64 mm |
| October | -0.9 °C | 12.3 °C | 37.59 mm |
| November | -8.9 °C | 1.4 °C | 20.83 mm |
| December | -16.3 °C | -6.4 °C | 18.03 mm |
| Annual | -2.5 °C | 10.1 °C | 475.5 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |