Lehr, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.6 °F (low) to 51.7 °F (high). Annual precipitation averages 20.8 Inches. Lehr is located in USDA Plant Hardiness Zone 4b. 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 | 1.3 °F | 19.4 °F | 0.48 in. |
| February | 5.6 °F | 24.1 °F | 0.56 in. |
| March | 16.7 °F | 36.3 °F | 0.87 in. |
| April | 29.3 °F | 52.5 °F | 1.25 in. |
| May | 42.1 °F | 65.1 °F | 3.01 in. |
| June | 53.0 °F | 74.4 °F | 3.91 in. |
| July | 57.8 °F | 80.6 °F | 3.22 in. |
| August | 55.5 °F | 79.6 °F | 2.46 in. |
| September | 46.2 °F | 70.8 °F | 2.13 in. |
| October | 33.0 °F | 54.9 °F | 1.74 in. |
| November | 19.0 °F | 38.4 °F | 0.58 in. |
| December | 8.1 °F | 24.8 °F | 0.56 in. |
| Annual | 30.6 °F | 51.7 °F | 20.77 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |