Underwood, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1 °C (low) to 11.1 °C (high). Annual precipitation averages 464.8 Millimeters. Underwood is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17 °C | -7 °C | 13.46 mm |
| February | -15.3 °C | -4.5 °C | 10.92 mm |
| March | -8.7 °C | 2.6 °C | 18.8 mm |
| April | -1.7 °C | 11.4 °C | 31.75 mm |
| May | 5.4 °C | 18.7 °C | 69.6 mm |
| June | 11.3 °C | 23.8 °C | 93.47 mm |
| July | 14.1 °C | 27.4 °C | 68.58 mm |
| August | 12.8 °C | 27.5 °C | 49.28 mm |
| September | 7.4 °C | 21.6 °C | 41.15 mm |
| October | 0.3 °C | 12.4 °C | 35.05 mm |
| November | -7.3 °C | 3.1 °C | 17.53 mm |
| December | -13.7 °C | -4.2 °C | 15.24 mm |
| Annual | -1 °C | 11.1 °C | 464.83 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |