Grano, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 28.9 °F (low) to 50.8 °F (high). Annual precipitation averages 17.9 Inches. Grano 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 | -0.5 °F | 17.6 °F | 0.59 in. |
| February | 3.5 °F | 22.4 °F | 0.51 in. |
| March | 14.9 °F | 34.3 °F | 0.75 in. |
| April | 28.2 °F | 52.1 °F | 0.92 in. |
| May | 41.0 °F | 65.3 °F | 2.59 in. |
| June | 51.9 °F | 74.0 °F | 3.61 in. |
| July | 55.9 °F | 80.0 °F | 2.64 in. |
| August | 53.3 °F | 80.5 °F | 1.95 in. |
| September | 44.1 °F | 70.6 °F | 1.53 in. |
| October | 31.5 °F | 54.0 °F | 1.37 in. |
| November | 17.5 °F | 35.9 °F | 0.76 in. |
| December | 5.4 °F | 22.6 °F | 0.67 in. |
| Annual | 28.9 °F | 50.8 °F | 17.89 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |