Langdon, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 26.8 °F (low) to 47.2 °F (high). Annual precipitation averages 20.4 Inches. Langdon 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 | -4.9 °F | 12.7 °F | 0.47 in. |
| February | -2.2 °F | 17.3 °F | 0.45 in. |
| March | 11.4 °F | 29.6 °F | 0.63 in. |
| April | 27.3 °F | 47.8 °F | 0.95 in. |
| May | 39.9 °F | 62.9 °F | 3.0 in. |
| June | 51.2 °F | 72.2 °F | 3.9 in. |
| July | 54.9 °F | 76.8 °F | 3.53 in. |
| August | 52.4 °F | 76.9 °F | 2.61 in. |
| September | 43.3 °F | 67.8 °F | 2.06 in. |
| October | 30.3 °F | 51.4 °F | 1.44 in. |
| November | 15.7 °F | 32.8 °F | 0.73 in. |
| December | 2.2 °F | 18.3 °F | 0.63 in. |
| Annual | 26.8 °F | 47.2 °F | 20.4 in. |
| 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 : -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 |