Fairdale, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.6 °C (low) to 8.7 °C (high). Annual precipitation averages 531.9 Millimeters. 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 | -20.4 °C | -10.6 °C | 12.7 mm |
| February | -18.8 °C | -7.9 °C | 11.94 mm |
| March | -11.2 °C | -1.1 °C | 18.54 mm |
| April | -2.4 °C | 9.2 °C | 24.38 mm |
| May | 4.7 °C | 17.6 °C | 77.98 mm |
| June | 11.1 °C | 22.7 °C | 101.35 mm |
| July | 13.2 °C | 25.3 °C | 88.65 mm |
| August | 11.8 °C | 25.2 °C | 65.79 mm |
| September | 6.6 °C | 20 °C | 50.8 mm |
| October | -0.8 °C | 11 °C | 39.88 mm |
| November | -8.9 °C | 0.6 °C | 21.84 mm |
| December | -16.4 °C | -7.5 °C | 18.03 mm |
| Annual | -2.6 °C | 8.7 °C | 531.88 mm |
| 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 : -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 |