The official National Weather Service forecast for Dupree — 45.0475°N, 101.601°W, 77.8 miles from I-90.
| Ziebach County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 33 | 45 | 57 | 68 | 80 | 88 | 86 | 77 | 60 | 45 | 32 | 58 |
| Avg low °F | 9 | 11 | 21 | 31 | 43 | 53 | 60 | 57 | 48 | 34 | 22 | 12 | 33 |
| Precip in | 0.3 | 0.5 | 0.9 | 1.9 | 3.3 | 3.1 | 2.2 | 2.1 | 1.4 | 1.5 | 0.4 | 0.5 | 18.1 |
1996–2025 normals for Ziebach County — the climate division Dupree sits in. All-time county record high 112.8°F (2006-07-16); record low -32.6°F (1989-12-22). Source: NOAA / National Weather Service.