Belle Fourche, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1 °C (low) to 15.4 °C (high). Annual precipitation averages 457.7 Millimeters. Belle Fourche 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 | -11 °C | 1.8 °C | 11.18 mm |
| February | -9.7 °C | 3.1 °C | 15.75 mm |
| March | -5 °C | 8.9 °C | 27.69 mm |
| April | -0.2 °C | 14.1 °C | 50.8 mm |
| May | 5.6 °C | 19.3 °C | 80.77 mm |
| June | 11.1 °C | 25.5 °C | 76.2 mm |
| July | 14.6 °C | 30.3 °C | 50.29 mm |
| August | 13.4 °C | 30.1 °C | 37.08 mm |
| September | 7.8 °C | 24.6 °C | 34.29 mm |
| October | 0.9 °C | 16.2 °C | 42.93 mm |
| November | -5.3 °C | 8.3 °C | 14.48 mm |
| December | -10.1 °C | 2.7 °C | 16.26 mm |
| Annual | 1 °C | 15.4 °C | 457.72 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |