Colfax, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32 °F (low) to 52.1 °F (high). Annual precipitation averages 24 Inches. 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 | 0.2 °F | 17.9 °F | 0.67 in. |
| February | 4.1 °F | 22.7 °F | 0.66 in. |
| March | 17.7 °F | 35.5 °F | 1.04 in. |
| April | 31.9 °F | 53.1 °F | 1.57 in. |
| May | 45.0 °F | 67.5 °F | 3.03 in. |
| June | 56.3 °F | 76.8 °F | 4.23 in. |
| July | 60.0 °F | 81.2 °F | 3.42 in. |
| August | 56.7 °F | 79.9 °F | 2.69 in. |
| September | 47.9 °F | 71.7 °F | 2.77 in. |
| October | 35.1 °F | 56.2 °F | 2.33 in. |
| November | 21.2 °F | 38.5 °F | 0.81 in. |
| December | 8.1 °F | 24.2 °F | 0.77 in. |
| Annual | 32 °F | 52.1 °F | 23.99 in. |
| 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 : -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 |