Bergen, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.2 °F (low) to 51.5 °F (high). Annual precipitation averages 19.3 Inches. Bergen 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 | -0.7 °F | 18.3 °F | 0.52 in. |
| February | 2.7 °F | 23.0 °F | 0.5 in. |
| March | 15.1 °F | 35.1 °F | 0.71 in. |
| April | 28.4 °F | 52.8 °F | 1.09 in. |
| May | 41.6 °F | 66.3 °F | 2.86 in. |
| June | 52.6 °F | 74.8 °F | 3.74 in. |
| July | 57.0 °F | 80.7 °F | 2.95 in. |
| August | 54.0 °F | 80.7 °F | 2.14 in. |
| September | 44.7 °F | 71.2 °F | 1.79 in. |
| October | 31.6 °F | 55.0 °F | 1.48 in. |
| November | 17.6 °F | 36.9 °F | 0.84 in. |
| December | 5.2 °F | 23.3 °F | 0.64 in. |
| Annual | 29.2 °F | 51.5 °F | 19.26 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |