Rolette, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 26.8 °F (low) to 48.6 °F (high). Annual precipitation averages 18.9 Inches. Rolette is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °F | 14.6 °F | 0.41 in. |
| February | -1.3 °F | 19.0 °F | 0.49 in. |
| March | 12.2 °F | 31.5 °F | 0.87 in. |
| April | 27.1 °F | 50.2 °F | 0.93 in. |
| May | 40.0 °F | 64.5 °F | 2.59 in. |
| June | 50.8 °F | 73.2 °F | 3.76 in. |
| July | 55.1 °F | 78.5 °F | 3.17 in. |
| August | 52.2 °F | 78.1 °F | 2.39 in. |
| September | 42.9 °F | 68.6 °F | 1.69 in. |
| October | 29.8 °F | 51.9 °F | 1.42 in. |
| November | 15.2 °F | 33.5 °F | 0.66 in. |
| December | 2.1 °F | 19.7 °F | 0.56 in. |
| Annual | 26.8 °F | 48.6 °F | 18.94 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°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 |