Montpelier, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.4 °F (low) to 52 °F (high). Annual precipitation averages 21.4 Inches. Montpelier 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.2 °F | 18.5 °F | 0.47 in. |
| February | 3.5 °F | 23.5 °F | 0.52 in. |
| March | 16.2 °F | 35.9 °F | 0.9 in. |
| April | 29.6 °F | 52.8 °F | 1.32 in. |
| May | 42.9 °F | 66.9 °F | 3.19 in. |
| June | 54.2 °F | 76.5 °F | 3.62 in. |
| July | 58.4 °F | 81.5 °F | 3.59 in. |
| August | 55.4 °F | 80.3 °F | 2.38 in. |
| September | 46.1 °F | 71.3 °F | 2.34 in. |
| October | 32.0 °F | 54.5 °F | 1.8 in. |
| November | 19.2 °F | 38.1 °F | 0.61 in. |
| December | 7.1 °F | 24.0 °F | 0.64 in. |
| Annual | 30.4 °F | 52 °F | 21.38 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |