The official National Weather Service forecast for Belle Fourche — 44.6714°N, 103.8521°W, population 5,089, 10.5 miles from I-90.
| Butte County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 36 | 47 | 57 | 67 | 79 | 88 | 86 | 77 | 61 | 47 | 35 | 59 |
| Avg low °F | 11 | 12 | 21 | 30 | 41 | 52 | 58 | 56 | 46 | 33 | 21 | 12 | 33 |
| Precip in | 0.4 | 0.5 | 0.8 | 1.7 | 3.1 | 2.9 | 2.0 | 1.8 | 1.2 | 1.4 | 0.4 | 0.4 | 16.6 |
1996–2025 normals for Butte County — the climate division Belle Fourche sits in. All-time county record high 109.7°F (2006-07-29); record low -35.9°F (1989-12-22). Source: NOAA / National Weather Service.