Hazelton, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.7 °F (low) to 52.9 °F (high). Annual precipitation averages 19.9 Inches. Hazelton is located in USDA Plant Hardiness Zone 4a. 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 | 2.1 °F | 20.6 °F | 0.41 in. |
| February | 5.8 °F | 25.4 °F | 0.5 in. |
| March | 17.2 °F | 37.9 °F | 0.8 in. |
| April | 29.4 °F | 53.5 °F | 1.36 in. |
| May | 41.9 °F | 66.1 °F | 2.81 in. |
| June | 52.6 °F | 75.2 °F | 3.6 in. |
| July | 57.7 °F | 81.9 °F | 3.44 in. |
| August | 55.3 °F | 81.2 °F | 2.36 in. |
| September | 46.1 °F | 72.1 °F | 1.71 in. |
| October | 33.1 °F | 55.8 °F | 1.81 in. |
| November | 19.1 °F | 39.1 °F | 0.53 in. |
| December | 8.3 °F | 25.7 °F | 0.61 in. |
| Annual | 30.7 °F | 52.9 °F | 19.94 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |