Marmarth, North Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.8 °C (low) to 13.8 °C (high). Annual precipitation averages 400 Millimeters. Marmarth is located in USDA Plant Hardiness Zone 4a. 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 | -14.8 °C | -2.2 °C | 9.65 mm |
| February | -12.7 °C | 0.2 °C | 11.68 mm |
| March | -7.2 °C | 6.4 °C | 20.57 mm |
| April | -1.2 °C | 13.2 °C | 33.78 mm |
| May | 4.7 °C | 19.2 °C | 63.75 mm |
| June | 10.4 °C | 24.5 °C | 75.69 mm |
| July | 13.4 °C | 29.1 °C | 54.86 mm |
| August | 11.7 °C | 29.7 °C | 36.58 mm |
| September | 6.6 °C | 23.8 °C | 35.81 mm |
| October | -0.6 °C | 14.8 °C | 33.27 mm |
| November | -7.4 °C | 6.3 °C | 13.46 mm |
| December | -12.9 °C | 0.2 °C | 10.92 mm |
| Annual | -0.8 °C | 13.8 °C | 400.02 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 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 |