Belcourt, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27 °F (low) to 47.3 °F (high). Annual precipitation averages 19.5 Inches. Belcourt is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.5 °F | 15.0 °F | 0.51 in. |
| February | -0.5 °F | 19.3 °F | 0.48 in. |
| March | 11.9 °F | 30.7 °F | 0.77 in. |
| April | 26.4 °F | 48.1 °F | 0.97 in. |
| May | 39.4 °F | 62.4 °F | 2.63 in. |
| June | 50.4 °F | 71.0 °F | 3.84 in. |
| July | 54.9 °F | 75.9 °F | 2.97 in. |
| August | 52.6 °F | 76.2 °F | 2.62 in. |
| September | 43.1 °F | 66.5 °F | 1.71 in. |
| October | 30.3 °F | 50.5 °F | 1.46 in. |
| November | 15.7 °F | 32.7 °F | 0.8 in. |
| December | 2.8 °F | 19.8 °F | 0.69 in. |
| Annual | 27 °F | 47.3 °F | 19.45 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |