Grace City, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30 °F (low) to 50.6 °F (high). Annual precipitation averages 20.6 Inches. Grace 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 | -0.7 °F | 16.9 °F | 0.5 in. |
| February | 2.9 °F | 21.6 °F | 0.45 in. |
| March | 15.5 °F | 34.1 °F | 0.77 in. |
| April | 29.1 °F | 51.4 °F | 1.05 in. |
| May | 42.3 °F | 65.8 °F | 2.6 in. |
| June | 53.6 °F | 75.1 °F | 3.75 in. |
| July | 57.8 °F | 80.1 °F | 3.63 in. |
| August | 55.1 °F | 79.4 °F | 2.62 in. |
| September | 45.9 °F | 70.6 °F | 2.03 in. |
| October | 32.9 °F | 54.3 °F | 1.65 in. |
| November | 18.7 °F | 36.3 °F | 0.77 in. |
| December | 6.3 °F | 22.1 °F | 0.73 in. |
| Annual | 30 °F | 50.6 °F | 20.55 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |