Buffalo Gap, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.2 °C (low) to 16.7 °C (high). Annual precipitation averages 485.7 Millimeters. 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 | -10.3 °C | 3.5 °C | 10.67 mm |
| February | -9.6 °C | 5.1 °C | 15.49 mm |
| March | -4.8 °C | 10.7 °C | 26.42 mm |
| April | -0.2 °C | 15.2 °C | 52.58 mm |
| May | 5.7 °C | 20.3 °C | 88.65 mm |
| June | 11.1 °C | 26.6 °C | 80.52 mm |
| July | 14.7 °C | 31.3 °C | 62.48 mm |
| August | 13.3 °C | 30.8 °C | 50.55 mm |
| September | 7.8 °C | 25.9 °C | 37.59 mm |
| October | 0.9 °C | 17.4 °C | 35.05 mm |
| November | -5.2 °C | 9.8 °C | 13.46 mm |
| December | -9.6 °C | 4.1 °C | 12.19 mm |
| Annual | 1.2 °C | 16.7 °C | 485.65 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |