Washburn, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.5 °F (low) to 53.2 °F (high). Annual precipitation averages 18.1 Inches. Washburn 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 | 2.1 °F | 21.0 °F | 0.42 in. |
| February | 5.4 °F | 25.4 °F | 0.45 in. |
| March | 17.2 °F | 38.2 °F | 0.66 in. |
| April | 29.1 °F | 54.1 °F | 1.21 in. |
| May | 41.8 °F | 66.6 °F | 2.76 in. |
| June | 52.2 °F | 75.8 °F | 3.38 in. |
| July | 57.1 °F | 82.4 °F | 2.92 in. |
| August | 54.8 °F | 82.3 °F | 2.09 in. |
| September | 45.7 °F | 72.3 °F | 1.74 in. |
| October | 32.8 °F | 56.0 °F | 1.32 in. |
| November | 19.5 °F | 38.9 °F | 0.6 in. |
| December | 8.4 °F | 25.8 °F | 0.51 in. |
| Annual | 30.5 °F | 53.2 °F | 18.06 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |