Haynes, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.7 °F (low) to 56.2 °F (high). Annual precipitation averages 16.5 Inches. Haynes 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 | 6.2 °F | 27.4 °F | 0.33 in. |
| February | 9.3 °F | 31.2 °F | 0.45 in. |
| March | 18.8 °F | 42.4 °F | 0.74 in. |
| April | 29.0 °F | 55.3 °F | 1.32 in. |
| May | 40.5 °F | 66.2 °F | 2.72 in. |
| June | 50.7 °F | 76.1 °F | 2.98 in. |
| July | 56.2 °F | 84.6 °F | 2.5 in. |
| August | 53.9 °F | 84.2 °F | 1.7 in. |
| September | 44.0 °F | 74.6 °F | 1.41 in. |
| October | 31.3 °F | 58.3 °F | 1.43 in. |
| November | 19.0 °F | 42.7 °F | 0.56 in. |
| December | 9.4 °F | 30.8 °F | 0.39 in. |
| Annual | 30.7 °F | 56.2 °F | 16.53 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |