Belfield, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 12.7 °C (high). Annual precipitation averages 429 Millimeters. Belfield is located in USDA Plant Hardiness Zone 4b. 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 | -14.6 °C | -3.4 °C | 9.14 mm |
| February | -12.7 °C | -1 °C | 10.92 mm |
| March | -7.4 °C | 5.2 °C | 17.78 mm |
| April | -1.6 °C | 12.2 °C | 31.75 mm |
| May | 4.7 °C | 18.4 °C | 70.1 mm |
| June | 10.1 °C | 23.9 °C | 76.45 mm |
| July | 13.2 °C | 28.5 °C | 67.82 mm |
| August | 12 °C | 28.4 °C | 40.64 mm |
| September | 6.8 °C | 22.7 °C | 45.72 mm |
| October | -0.2 °C | 13.5 °C | 35.05 mm |
| November | -7 °C | 4.9 °C | 12.7 mm |
| December | -12.3 °C | -1.2 °C | 10.92 mm |
| Annual | -0.8 °C | 12.7 °C | 428.99 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |