Leal, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.9 °C (low) to 10.5 °C (high). Annual precipitation averages 548.6 Millimeters. Leal is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.9 °C | -8.2 °C | 12.7 mm |
| February | -15.8 °C | -5.6 °C | 12.45 mm |
| March | -9.1 °C | 1.3 °C | 20.57 mm |
| April | -1.3 °C | 10.7 °C | 29.97 mm |
| May | 5.9 °C | 18.8 °C | 75.69 mm |
| June | 12.3 °C | 23.9 °C | 99.82 mm |
| July | 14.6 °C | 26.8 °C | 92.71 mm |
| August | 13 °C | 26.3 °C | 68.58 mm |
| September | 7.7 °C | 21.3 °C | 57.91 mm |
| October | 0.7 °C | 12.6 °C | 44.45 mm |
| November | -7.2 °C | 2.9 °C | 17.02 mm |
| December | -13.8 °C | -5 °C | 16.76 mm |
| Annual | -0.9 °C | 10.5 °C | 548.63 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |