Rolette, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.9 °C (low) to 9.2 °C (high). Annual precipitation averages 481.1 Millimeters. 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 | -20.2 °C | -9.7 °C | 10.41 mm |
| February | -18.5 °C | -7.2 °C | 12.45 mm |
| March | -11 °C | -0.3 °C | 22.1 mm |
| April | -2.7 °C | 10.1 °C | 23.62 mm |
| May | 4.4 °C | 18.1 °C | 65.79 mm |
| June | 10.4 °C | 22.9 °C | 95.5 mm |
| July | 12.8 °C | 25.8 °C | 80.52 mm |
| August | 11.2 °C | 25.6 °C | 60.71 mm |
| September | 6.1 °C | 20.3 °C | 42.93 mm |
| October | -1.2 °C | 11.1 °C | 36.07 mm |
| November | -9.3 °C | 0.8 °C | 16.76 mm |
| December | -16.6 °C | -6.8 °C | 14.22 mm |
| Annual | -2.9 °C | 9.2 °C | 481.08 mm |
| 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 : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |