Hazen, North Dakota has a Humid Continental Mild Summer With Dry Winters climate (Köppen classification: Dwb). Average annual temperatures range from -1.5 °C (low) to 12 °C (high). Annual precipitation averages 446.5 Millimeters. Hazen 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 | -16.9 °C | -5.7 °C | 9.4 mm |
| February | -14.6 °C | -3 °C | 10.92 mm |
| March | -8.7 °C | 3.8 °C | 15.24 mm |
| April | -2.2 °C | 12.4 °C | 31.75 mm |
| May | 4.4 °C | 18.9 °C | 69.85 mm |
| June | 10.3 °C | 23.9 °C | 85.09 mm |
| July | 13.1 °C | 28.1 °C | 70.36 mm |
| August | 11.6 °C | 28.1 °C | 48.51 mm |
| September | 6.1 °C | 22.8 °C | 43.43 mm |
| October | -0.3 °C | 13.8 °C | 34.29 mm |
| November | -7.6 °C | 4.4 °C | 14.99 mm |
| December | -13.5 °C | -3 °C | 12.7 mm |
| Annual | -1.5 °C | 12 °C | 446.53 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 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 | Dwb - Humid Continental Mild Summer With Dry Winters |