Berthold, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 28.9 °F (low) to 49.9 °F (high). Annual precipitation averages 18.4 Inches. Berthold 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 | 0.2 °F | 17.6 °F | 0.57 in. |
| February | 4.2 °F | 22.2 °F | 0.57 in. |
| March | 15.2 °F | 34.0 °F | 0.74 in. |
| April | 28.0 °F | 50.8 °F | 1.07 in. |
| May | 40.6 °F | 63.9 °F | 2.64 in. |
| June | 51.2 °F | 72.1 °F | 3.82 in. |
| July | 55.5 °F | 78.2 °F | 2.71 in. |
| August | 53.1 °F | 79.3 °F | 1.87 in. |
| September | 43.7 °F | 69.5 °F | 1.62 in. |
| October | 31.5 °F | 52.9 °F | 1.34 in. |
| November | 17.8 °F | 35.6 °F | 0.75 in. |
| December | 6.2 °F | 22.1 °F | 0.68 in. |
| Annual | 28.9 °F | 49.9 °F | 18.38 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |