Granville, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.8 °C (low) to 11.1 °C (high). Annual precipitation averages 484.6 Millimeters. Granville 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 | -18.5 °C | -7.8 °C | 11.43 mm |
| February | -16.4 °C | -5 °C | 14.48 mm |
| March | -9.6 °C | 1.9 °C | 18.8 mm |
| April | -2.1 °C | 11.9 °C | 25.15 mm |
| May | 5.1 °C | 19.5 °C | 71.63 mm |
| June | 11.2 °C | 24.3 °C | 101.6 mm |
| July | 13.6 °C | 27.7 °C | 75.69 mm |
| August | 11.9 °C | 27.7 °C | 53.59 mm |
| September | 6.8 °C | 22 °C | 41.4 mm |
| October | -0.5 °C | 13.1 °C | 34.8 mm |
| November | -8.3 °C | 2.7 °C | 20.07 mm |
| December | -15.2 °C | -4.9 °C | 16 mm |
| Annual | -1.8 °C | 11.1 °C | 484.64 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |