New Rockford, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.1 °C (low) to 10.4 °C (high). Annual precipitation averages 496.3 Millimeters. New Rockford 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 | -18.1 °C | -8.2 °C | 11.43 mm |
| February | -16.1 °C | -5.6 °C | 10.67 mm |
| March | -9.3 °C | 1.2 °C | 17.78 mm |
| April | -1.7 °C | 10.8 °C | 27.18 mm |
| May | 5.7 °C | 18.8 °C | 62.48 mm |
| June | 11.8 °C | 23.8 °C | 96.01 mm |
| July | 14.4 °C | 26.7 °C | 85.34 mm |
| August | 12.9 °C | 26.5 °C | 64.26 mm |
| September | 7.8 °C | 21.4 °C | 48.01 mm |
| October | 0.6 °C | 12.4 °C | 39.62 mm |
| November | -7.3 °C | 2.4 °C | 17.27 mm |
| December | -14.3 °C | -5.3 °C | 16.26 mm |
| Annual | -1.1 °C | 10.4 °C | 496.31 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 |