Buffalo Gap, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.1 °F (low) to 62.1 °F (high). Annual precipitation averages 19.1 Inches. Buffalo Gap is located in USDA Plant Hardiness Zone 5a. 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 | 13.4 °F | 38.3 °F | 0.42 in. |
| February | 14.8 °F | 41.2 °F | 0.61 in. |
| March | 23.3 °F | 51.3 °F | 1.04 in. |
| April | 31.6 °F | 59.4 °F | 2.07 in. |
| May | 42.3 °F | 68.6 °F | 3.49 in. |
| June | 52.0 °F | 79.9 °F | 3.17 in. |
| July | 58.4 °F | 88.3 °F | 2.46 in. |
| August | 56.0 °F | 87.4 °F | 1.99 in. |
| September | 46.0 °F | 78.7 °F | 1.48 in. |
| October | 33.7 °F | 63.4 °F | 1.38 in. |
| November | 22.7 °F | 49.6 °F | 0.53 in. |
| December | 14.7 °F | 39.4 °F | 0.48 in. |
| Annual | 34.1 °F | 62.1 °F | 19.12 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |