The official National Weather Service forecast for McCook — 40.2019°N, 100.6257°W, population 7,395, 55.3 miles from I-80.
| Red Willow County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 41 | 44 | 56 | 66 | 75 | 86 | 91 | 89 | 82 | 68 | 55 | 43 | 66 |
| Avg low °F | 16 | 18 | 27 | 36 | 46 | 58 | 63 | 61 | 52 | 38 | 26 | 17 | 38 |
| Precip in | 0.3 | 0.5 | 1.1 | 2.0 | 3.4 | 3.2 | 3.1 | 2.9 | 1.8 | 1.5 | 0.7 | 0.5 | 21.0 |
1996–2025 normals for Red Willow County — the climate division McCook sits in. All-time county record high 112.0°F (2012-06-27); record low -30.1°F (1989-12-22). Source: NOAA / National Weather Service.