Berthold, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.7 °C (low) to 9.9 °C (high). Annual precipitation averages 466.9 Millimeters. 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 | -17.7 °C | -8 °C | 14.48 mm |
| February | -15.4 °C | -5.4 °C | 14.48 mm |
| March | -9.3 °C | 1.1 °C | 18.8 mm |
| April | -2.2 °C | 10.4 °C | 27.18 mm |
| May | 4.8 °C | 17.7 °C | 67.06 mm |
| June | 10.7 °C | 22.3 °C | 97.03 mm |
| July | 13.1 °C | 25.7 °C | 68.83 mm |
| August | 11.7 °C | 26.3 °C | 47.5 mm |
| September | 6.5 °C | 20.8 °C | 41.15 mm |
| October | -0.3 °C | 11.6 °C | 34.04 mm |
| November | -7.9 °C | 2 °C | 19.05 mm |
| December | -14.3 °C | -5.5 °C | 17.27 mm |
| Annual | -1.7 °C | 9.9 °C | 466.87 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |