Haynes, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.7 °C (low) to 13.4 °C (high). Annual precipitation averages 419.9 Millimeters. 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 | -14.3 °C | -2.6 °C | 8.38 mm |
| February | -12.6 °C | -0.4 °C | 11.43 mm |
| March | -7.3 °C | 5.8 °C | 18.8 mm |
| April | -1.7 °C | 12.9 °C | 33.53 mm |
| May | 4.7 °C | 19 °C | 69.09 mm |
| June | 10.4 °C | 24.5 °C | 75.69 mm |
| July | 13.4 °C | 29.2 °C | 63.5 mm |
| August | 12.2 °C | 29 °C | 43.18 mm |
| September | 6.7 °C | 23.7 °C | 35.81 mm |
| October | -0.4 °C | 14.6 °C | 36.32 mm |
| November | -7.2 °C | 5.9 °C | 14.22 mm |
| December | -12.6 °C | -0.7 °C | 9.91 mm |
| Annual | -0.7 °C | 13.4 °C | 419.86 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |