Coleharbor, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30 °F (low) to 52.2 °F (high). Annual precipitation averages 18.2 Inches. Coleharbor 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 | 1.5 °F | 19.8 °F | 0.5 in. |
| February | 4.6 °F | 24.4 °F | 0.4 in. |
| March | 16.5 °F | 37.0 °F | 0.68 in. |
| April | 28.6 °F | 52.9 °F | 1.16 in. |
| May | 41.3 °F | 65.6 °F | 2.78 in. |
| June | 52.0 °F | 74.6 °F | 3.75 in. |
| July | 56.9 °F | 81.3 °F | 2.75 in. |
| August | 54.5 °F | 81.5 °F | 2.04 in. |
| September | 45.0 °F | 71.2 °F | 1.62 in. |
| October | 32.3 °F | 55.0 °F | 1.36 in. |
| November | 19.0 °F | 38.1 °F | 0.64 in. |
| December | 7.6 °F | 24.8 °F | 0.55 in. |
| Annual | 30 °F | 52.2 °F | 18.23 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 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 | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |