Coleharbor, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.1 °C (low) to 11.2 °C (high). Annual precipitation averages 463 Millimeters. 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 | -16.9 °C | -6.8 °C | 12.7 mm |
| February | -15.2 °C | -4.2 °C | 10.16 mm |
| March | -8.6 °C | 2.8 °C | 17.27 mm |
| April | -1.9 °C | 11.6 °C | 29.46 mm |
| May | 5.2 °C | 18.7 °C | 70.61 mm |
| June | 11.1 °C | 23.7 °C | 95.25 mm |
| July | 13.8 °C | 27.4 °C | 69.85 mm |
| August | 12.5 °C | 27.5 °C | 51.82 mm |
| September | 7.2 °C | 21.8 °C | 41.15 mm |
| October | 0.2 °C | 12.8 °C | 34.54 mm |
| November | -7.2 °C | 3.4 °C | 16.26 mm |
| December | -13.6 °C | -4 °C | 13.97 mm |
| Annual | -1.1 °C | 11.2 °C | 463.04 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |