Westhope, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.6 °F (low) to 50.2 °F (high). Annual precipitation averages 18.7 Inches. 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 | -3.8 °F | 15.2 °F | 0.57 in. |
| February | 0.3 °F | 20.2 °F | 0.57 in. |
| March | 13.1 °F | 32.5 °F | 0.84 in. |
| April | 28.2 °F | 52.6 °F | 1.0 in. |
| May | 40.4 °F | 66.5 °F | 2.5 in. |
| June | 51.5 °F | 75.0 °F | 3.87 in. |
| July | 55.5 °F | 80.1 °F | 2.64 in. |
| August | 53.1 °F | 80.5 °F | 2.12 in. |
| September | 43.5 °F | 71.0 °F | 1.6 in. |
| October | 30.4 °F | 54.1 °F | 1.48 in. |
| November | 15.9 °F | 34.6 °F | 0.82 in. |
| December | 2.6 °F | 20.4 °F | 0.71 in. |
| Annual | 27.6 °F | 50.2 °F | 18.72 in. |
| 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 : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |