Arnegard, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30 °F (low) to 53.8 °F (high). Annual precipitation averages 16.3 Inches. Arnegard 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 | 3.4 °F | 22.7 °F | 0.45 in. |
| February | 7.4 °F | 27.6 °F | 0.36 in. |
| March | 17.6 °F | 39.6 °F | 0.57 in. |
| April | 29.1 °F | 54.5 °F | 1.0 in. |
| May | 40.3 °F | 65.8 °F | 2.45 in. |
| June | 50.4 °F | 74.7 °F | 3.24 in. |
| July | 55.5 °F | 82.9 °F | 2.72 in. |
| August | 53.7 °F | 82.8 °F | 1.66 in. |
| September | 43.9 °F | 72.3 °F | 1.59 in. |
| October | 31.7 °F | 55.8 °F | 1.13 in. |
| November | 18.9 °F | 39.4 °F | 0.6 in. |
| December | 8.2 °F | 27.0 °F | 0.52 in. |
| Annual | 30 °F | 53.8 °F | 16.29 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 |