Ross, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.9 °F (low) to 49.7 °F (high). Annual precipitation averages 17.8 Inches. Ross 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 | -0.3 °F | 17.7 °F | 0.52 in. |
| February | 3.5 °F | 22.1 °F | 0.48 in. |
| March | 14.9 °F | 34.3 °F | 0.68 in. |
| April | 27.3 °F | 51.1 °F | 1.01 in. |
| May | 39.1 °F | 63.3 °F | 2.44 in. |
| June | 49.7 °F | 71.7 °F | 3.78 in. |
| July | 54.1 °F | 78.1 °F | 2.81 in. |
| August | 51.9 °F | 78.9 °F | 1.88 in. |
| September | 42.1 °F | 69.2 °F | 1.59 in. |
| October | 30.1 °F | 52.6 °F | 1.31 in. |
| November | 16.9 °F | 35.5 °F | 0.69 in. |
| December | 5.4 °F | 22.1 °F | 0.62 in. |
| Annual | 27.9 °F | 49.7 °F | 17.81 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 |