Granville, 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 52 °F (high). Annual precipitation averages 19.1 Inches. 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 | -1.3 °F | 18.0 °F | 0.45 in. |
| February | 2.4 °F | 23.0 °F | 0.57 in. |
| March | 14.8 °F | 35.4 °F | 0.74 in. |
| April | 28.3 °F | 53.5 °F | 0.99 in. |
| May | 41.2 °F | 67.1 °F | 2.82 in. |
| June | 52.2 °F | 75.8 °F | 4.0 in. |
| July | 56.4 °F | 81.8 °F | 2.98 in. |
| August | 53.5 °F | 81.9 °F | 2.11 in. |
| September | 44.3 °F | 71.6 °F | 1.63 in. |
| October | 31.1 °F | 55.5 °F | 1.37 in. |
| November | 17.0 °F | 36.9 °F | 0.79 in. |
| December | 4.7 °F | 23.2 °F | 0.63 in. |
| Annual | 28.7 °F | 52 °F | 19.08 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 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |