The official National Weather Service forecast for Harlan — 41.653°N, 95.3256°W, population 4,713, 13.9 miles from I-80.
| Shelby County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 34 | 48 | 62 | 72 | 82 | 84 | 82 | 77 | 64 | 49 | 35 | 60 |
| Avg low °F | 12 | 15 | 27 | 37 | 49 | 60 | 63 | 60 | 52 | 40 | 28 | 17 | 38 |
| Precip in | 0.8 | 1.1 | 1.9 | 3.3 | 5.1 | 5.1 | 3.8 | 4.5 | 3.1 | 2.6 | 1.5 | 1.2 | 34.0 |
1996–2025 normals for Shelby County — the climate division Harlan sits in. All-time county record high 104.1°F (1955-07-31); record low -28.1°F (1974-01-12). Source: NOAA / National Weather Service.