The official National Weather Service forecast for Rock Hill — 34.9249°N, 81.0251°W, population 218,443, 3.1 miles from I-77. Forecasts here are written by NWS GSP, this county’s forecast office.
| York County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 53 | 57 | 65 | 73 | 80 | 87 | 90 | 88 | 83 | 74 | 64 | 56 | 72 |
| Avg low °F | 31 | 34 | 40 | 48 | 57 | 65 | 69 | 68 | 61 | 49 | 39 | 33 | 50 |
| Precip in | 3.7 | 3.1 | 3.8 | 3.7 | 3.7 | 3.8 | 4.0 | 4.0 | 3.8 | 2.7 | 3.0 | 3.9 | 43.2 |
1996–2025 normals for York County — the climate division Rock Hill sits in. All-time county record high 105.2°F (1983-08-22); record low -3.1°F (1985-01-22). Source: NOAA / National Weather Service.