Mountain, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 28.7 °F (low) to 48.8 °F (high). Annual precipitation averages 21.5 Inches. 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 | -3.0 °F | 14.1 °F | 0.56 in. |
| February | 0.1 °F | 18.8 °F | 0.53 in. |
| March | 13.7 °F | 31.3 °F | 0.81 in. |
| April | 28.6 °F | 49.7 °F | 0.96 in. |
| May | 41.3 °F | 64.4 °F | 3.17 in. |
| June | 53.0 °F | 74.0 °F | 3.87 in. |
| July | 56.8 °F | 78.4 °F | 3.31 in. |
| August | 53.8 °F | 78.3 °F | 2.68 in. |
| September | 45.0 °F | 69.1 °F | 2.22 in. |
| October | 32.6 °F | 52.7 °F | 1.66 in. |
| November | 18.0 °F | 34.5 °F | 0.92 in. |
| December | 4.1 °F | 19.9 °F | 0.78 in. |
| Annual | 28.7 °F | 48.8 °F | 21.47 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |