The official National Weather Service forecast for Milbank — 45.2191°N, 96.6356°W, 21 miles from I-29.
| Grant County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 22 | 26 | 39 | 54 | 68 | 78 | 83 | 80 | 73 | 58 | 42 | 27 | 54 |
| Avg low °F | 4 | 7 | 20 | 32 | 45 | 56 | 60 | 58 | 50 | 36 | 23 | 10 | 33 |
| Precip in | 0.6 | 0.6 | 1.1 | 2.5 | 3.2 | 3.6 | 3.4 | 3.2 | 2.6 | 2.5 | 1.0 | 0.9 | 25.2 |
1996–2025 normals for Grant County — the climate division Milbank sits in. All-time county record high 103.0°F (1988-08-01); record low -37.8°F (1994-02-09). Source: NOAA / National Weather Service.