Coleraine, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.6 °C (low) to 10.3 °C (high). Annual precipitation averages 731.8 Millimeters. Coleraine 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 | -18.9 °C | -7.8 °C | 22.86 mm |
| February | -17.2 °C | -4.2 °C | 19.81 mm |
| March | -9.7 °C | 3 °C | 30.99 mm |
| April | -2.1 °C | 10.7 °C | 51.56 mm |
| May | 4.8 °C | 18.3 °C | 81.79 mm |
| June | 10.7 °C | 23.3 °C | 114.81 mm |
| July | 13.3 °C | 25.8 °C | 105.66 mm |
| August | 12.1 °C | 24.9 °C | 85.85 mm |
| September | 7.5 °C | 20 °C | 82.8 mm |
| October | 1.1 °C | 11.7 °C | 69.85 mm |
| November | -6.3 °C | 2.3 °C | 37.85 mm |
| December | -14.2 °C | -5 °C | 27.94 mm |
| Annual | -1.6 °C | 10.3 °C | 731.77 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |