The official National Weather Service forecast for Stanley — 48.3172°N, 102.3905°W, 99.5 miles from I-94.
| Mountrail County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 20 | 23 | 36 | 53 | 66 | 75 | 82 | 81 | 72 | 54 | 37 | 24 | 52 |
| Avg low °F | 2 | 4 | 15 | 28 | 40 | 50 | 56 | 53 | 44 | 31 | 18 | 6 | 29 |
| Precip in | 0.4 | 0.4 | 0.6 | 1.1 | 2.7 | 3.1 | 2.7 | 1.8 | 1.6 | 1.2 | 0.5 | 0.6 | 16.7 |
1996–2025 normals for Mountrail County — the climate division Stanley sits in. All-time county record high 103.7°F (2007-07-24); record low -41.1°F (1983-12-24). Source: NOAA / National Weather Service.