The official National Weather Service forecast for Plentywood — 48.7747°N, 104.5625°W, 114.4 miles from I-94.
| Sheridan County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 21 | 25 | 38 | 54 | 66 | 75 | 83 | 82 | 72 | 55 | 37 | 24 | 53 |
| Avg low °F | 2 | 4 | 16 | 28 | 39 | 49 | 54 | 52 | 43 | 30 | 17 | 5 | 28 |
| Precip in | 0.4 | 0.3 | 0.5 | 0.9 | 2.3 | 3.0 | 2.2 | 1.4 | 1.2 | 0.9 | 0.5 | 0.5 | 14.1 |
1996–2025 normals for Sheridan County — the climate division Plentywood sits in. All-time county record high 108.3°F (2007-07-25); record low -48.2°F (1954-01-20). Source: NOAA / National Weather Service.