Mountain, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.9 °C (low) to 9.3 °C (high). Annual precipitation averages 545.3 Millimeters. Mountain 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.4 °C | -9.9 °C | 14.22 mm |
| February | -17.7 °C | -7.3 °C | 13.46 mm |
| March | -10.2 °C | -0.4 °C | 20.57 mm |
| April | -1.9 °C | 9.8 °C | 24.38 mm |
| May | 5.2 °C | 18 °C | 80.52 mm |
| June | 11.7 °C | 23.3 °C | 98.3 mm |
| July | 13.8 °C | 25.8 °C | 84.07 mm |
| August | 12.1 °C | 25.7 °C | 68.07 mm |
| September | 7.2 °C | 20.6 °C | 56.39 mm |
| October | 0.3 °C | 11.5 °C | 42.16 mm |
| November | -7.8 °C | 1.4 °C | 23.37 mm |
| December | -15.5 °C | -6.7 °C | 19.81 mm |
| Annual | -1.9 °C | 9.3 °C | 545.32 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |