Lantry, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1 °C (low) to 14.2 °C (high). Annual precipitation averages 473.2 Millimeters. 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 | -12.8 °C | -1.8 °C | 10.16 mm |
| February | -11.3 °C | 0 °C | 15.24 mm |
| March | -6.1 °C | 6.5 °C | 23.11 mm |
| April | -0.2 °C | 13.7 °C | 47.5 mm |
| May | 6.3 °C | 19.7 °C | 80.52 mm |
| June | 12.2 °C | 25.7 °C | 84.84 mm |
| July | 15.6 °C | 30.4 °C | 62.74 mm |
| August | 14.2 °C | 30 °C | 48.26 mm |
| September | 8.8 °C | 24.6 °C | 33.27 mm |
| October | 1.4 °C | 15.3 °C | 41.91 mm |
| November | -5.5 °C | 6.8 °C | 12.45 mm |
| December | -10.9 °C | -0.1 °C | 13.21 mm |
| Annual | 1 °C | 14.2 °C | 473.21 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |