Grandin, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 10.7 °C (high). Annual precipitation averages 599.7 Millimeters. Grandin 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 | -18.5 °C | -8.8 °C | 16.51 mm |
| February | -16.3 °C | -5.8 °C | 15.49 mm |
| March | -8.7 °C | 1.3 °C | 24.38 mm |
| April | -0.4 °C | 11.4 °C | 31.5 mm |
| May | 6.7 °C | 19.4 °C | 75.69 mm |
| June | 13.1 °C | 24.7 °C | 105.16 mm |
| July | 15.1 °C | 27.1 °C | 93.98 mm |
| August | 13.4 °C | 26.6 °C | 69.09 mm |
| September | 8.4 °C | 21.9 °C | 72.64 mm |
| October | 1.6 °C | 13.1 °C | 54.36 mm |
| November | -6.5 °C | 3.1 °C | 20.57 mm |
| December | -13.9 °C | -5.2 °C | 20.32 mm |
| Annual | -0.5 °C | 10.7 °C | 599.69 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |