Alexander, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1 °C (low) to 12.3 °C (high). Annual precipitation averages 387.4 Millimeters. Alexander 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.8 °C | -4.9 °C | 9.4 mm |
| February | -13.5 °C | -2.2 °C | 7.37 mm |
| March | -7.9 °C | 4.5 °C | 13.97 mm |
| April | -1.4 °C | 12.8 °C | 24.38 mm |
| May | 4.8 °C | 19 °C | 60.2 mm |
| June | 10.4 °C | 23.9 °C | 77.22 mm |
| July | 13.4 °C | 28.6 °C | 67.31 mm |
| August | 12.3 °C | 28.4 °C | 40.64 mm |
| September | 6.7 °C | 22.7 °C | 36.58 mm |
| October | 0 °C | 13.5 °C | 26.16 mm |
| November | -7.2 °C | 4.3 °C | 13.72 mm |
| December | -13.2 °C | -2.6 °C | 10.41 mm |
| Annual | -1 °C | 12.3 °C | 387.36 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |