Alexander, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.3 °F (low) to 54.2 °F (high). Annual precipitation averages 15.3 Inches. 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 | 3.6 °F | 23.1 °F | 0.37 in. |
| February | 7.7 °F | 28.1 °F | 0.29 in. |
| March | 17.8 °F | 40.1 °F | 0.55 in. |
| April | 29.5 °F | 55.1 °F | 0.96 in. |
| May | 40.7 °F | 66.2 °F | 2.37 in. |
| June | 50.8 °F | 75.1 °F | 3.04 in. |
| July | 56.1 °F | 83.4 °F | 2.65 in. |
| August | 54.1 °F | 83.2 °F | 1.6 in. |
| September | 44.1 °F | 72.8 °F | 1.44 in. |
| October | 32.0 °F | 56.3 °F | 1.03 in. |
| November | 19.1 °F | 39.7 °F | 0.54 in. |
| December | 8.3 °F | 27.3 °F | 0.41 in. |
| Annual | 30.3 °F | 54.2 °F | 15.25 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |