Lantry, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.8 °F (low) to 57.6 °F (high). Annual precipitation averages 18.6 Inches. Lantry is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.0 °F | 28.7 °F | 0.4 in. |
| February | 11.7 °F | 32.0 °F | 0.6 in. |
| March | 21.0 °F | 43.7 °F | 0.91 in. |
| April | 31.7 °F | 56.7 °F | 1.87 in. |
| May | 43.4 °F | 67.4 °F | 3.17 in. |
| June | 53.9 °F | 78.3 °F | 3.34 in. |
| July | 60.0 °F | 86.8 °F | 2.47 in. |
| August | 57.5 °F | 86.0 °F | 1.9 in. |
| September | 47.9 °F | 76.3 °F | 1.31 in. |
| October | 34.6 °F | 59.6 °F | 1.65 in. |
| November | 22.1 °F | 44.2 °F | 0.49 in. |
| December | 12.3 °F | 31.9 °F | 0.52 in. |
| Annual | 33.8 °F | 57.6 °F | 18.63 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |