The official National Weather Service forecast for Lancaster — 34.7204°N, 80.7709°W, population 22,709, 15.6 miles from I-77. Forecasts here are written by NWS CAE, this county’s forecast office.
| Lancaster County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 54 | 58 | 66 | 74 | 81 | 88 | 91 | 89 | 84 | 74 | 64 | 57 | 73 |
| Avg low °F | 31 | 35 | 41 | 48 | 57 | 65 | 69 | 68 | 62 | 50 | 40 | 34 | 50 |
| Precip in | 3.7 | 3.1 | 3.6 | 3.3 | 3.6 | 3.8 | 4.2 | 4.1 | 4.1 | 2.8 | 2.9 | 3.9 | 43.1 |
1996–2025 normals for Lancaster County — the climate division Lancaster sits in. All-time county record high 105.9°F (1983-08-22); record low -1.6°F (1985-01-21). Source: NOAA / National Weather Service.