The official National Weather Service forecast for Grant — 40.8419°N, 101.7252°W, 19.4 miles from I-80.
| Perkins County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 42 | 54 | 62 | 72 | 84 | 90 | 87 | 80 | 66 | 53 | 42 | 64 |
| Avg low °F | 15 | 17 | 26 | 34 | 45 | 56 | 61 | 59 | 50 | 37 | 25 | 17 | 37 |
| Precip in | 0.4 | 0.5 | 0.9 | 2.0 | 3.2 | 3.1 | 2.8 | 2.4 | 1.5 | 1.3 | 0.5 | 0.4 | 19.0 |
1996–2025 normals for Perkins County — the climate division Grant sits in. All-time county record high 108.2°F (1954-07-11); record low -33.3°F (1989-12-22). Source: NOAA / National Weather Service.