Langford, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.6 °F (low) to 53.8 °F (high). Annual precipitation averages 23.7 Inches. Langford 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 | 1.9 °F | 20.6 °F | 0.6 in. |
| February | 6.4 °F | 25.8 °F | 0.61 in. |
| March | 18.7 °F | 38.5 °F | 0.99 in. |
| April | 31.9 °F | 54.7 °F | 2.02 in. |
| May | 45.0 °F | 68.0 °F | 3.18 in. |
| June | 55.9 °F | 77.5 °F | 4.06 in. |
| July | 60.4 °F | 82.2 °F | 3.78 in. |
| August | 57.8 °F | 81.1 °F | 2.4 in. |
| September | 48.6 °F | 72.9 °F | 2.42 in. |
| October | 34.8 °F | 57.8 °F | 2.18 in. |
| November | 21.1 °F | 40.1 °F | 0.77 in. |
| December | 8.9 °F | 26.4 °F | 0.68 in. |
| Annual | 32.6 °F | 53.8 °F | 23.69 in. |
| 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 : -30°F to -25°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 |