Montpelier, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.9 °C (low) to 11.1 °C (high). Annual precipitation averages 543.1 Millimeters. 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 | -17.9 °C | -7.5 °C | 11.94 mm |
| February | -15.8 °C | -4.7 °C | 13.21 mm |
| March | -8.8 °C | 2.2 °C | 22.86 mm |
| April | -1.3 °C | 11.6 °C | 33.53 mm |
| May | 6.1 °C | 19.4 °C | 81.03 mm |
| June | 12.3 °C | 24.7 °C | 91.95 mm |
| July | 14.7 °C | 27.5 °C | 91.19 mm |
| August | 13 °C | 26.8 °C | 60.45 mm |
| September | 7.8 °C | 21.8 °C | 59.44 mm |
| October | 0 °C | 12.5 °C | 45.72 mm |
| November | -7.1 °C | 3.4 °C | 15.49 mm |
| December | -13.8 °C | -4.4 °C | 16.26 mm |
| Annual | -0.9 °C | 11.1 °C | 543.07 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |