Fairdale, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.3 °F (low) to 47.7 °F (high). Annual precipitation averages 20.9 Inches. Fairdale 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °F | 12.9 °F | 0.5 in. |
| February | -1.9 °F | 17.7 °F | 0.47 in. |
| March | 11.9 °F | 30.1 °F | 0.73 in. |
| April | 27.7 °F | 48.6 °F | 0.96 in. |
| May | 40.5 °F | 63.7 °F | 3.07 in. |
| June | 51.9 °F | 72.9 °F | 3.99 in. |
| July | 55.8 °F | 77.6 °F | 3.49 in. |
| August | 53.3 °F | 77.4 °F | 2.59 in. |
| September | 43.8 °F | 68.0 °F | 2.0 in. |
| October | 30.6 °F | 51.8 °F | 1.57 in. |
| November | 16.0 °F | 33.1 °F | 0.86 in. |
| December | 2.5 °F | 18.5 °F | 0.71 in. |
| Annual | 27.3 °F | 47.7 °F | 20.94 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 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |