Colfax, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Annual precipitation averages 609.4 Millimeters. Colfax 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.7 °C | -7.8 °C | 17.02 mm |
| February | -15.5 °C | -5.2 °C | 16.76 mm |
| March | -7.9 °C | 1.9 °C | 26.42 mm |
| April | -0.1 °C | 11.7 °C | 39.88 mm |
| May | 7.2 °C | 19.7 °C | 76.96 mm |
| June | 13.5 °C | 24.9 °C | 107.44 mm |
| July | 15.6 °C | 27.3 °C | 86.87 mm |
| August | 13.7 °C | 26.6 °C | 68.33 mm |
| September | 8.8 °C | 22.1 °C | 70.36 mm |
| October | 1.7 °C | 13.4 °C | 59.18 mm |
| November | -6 °C | 3.6 °C | 20.57 mm |
| December | -13.3 °C | -4.3 °C | 19.56 mm |
| Annual | 0 °C | 11.2 °C | 609.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |