The official National Weather Service forecast for Westminster — 39.5754°N, 76.9958°W, population 40,040, 10.5 miles from I-795. Forecasts here are written by NWS LWX, this county’s forecast office.
| Carroll County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 44 | 53 | 64 | 73 | 82 | 86 | 84 | 77 | 66 | 54 | 45 | 64 |
| Avg low °F | 23 | 25 | 32 | 41 | 51 | 60 | 64 | 63 | 56 | 45 | 34 | 27 | 43 |
| Precip in | 3.2 | 2.7 | 3.5 | 3.6 | 4.4 | 4.3 | 4.4 | 3.7 | 4.8 | 3.9 | 2.9 | 3.6 | 45.0 |
1996–2025 normals for Carroll County — the climate division Westminster sits in. All-time county record high 101.4°F (1988-07-17); record low -11.8°F (1982-01-17). Source: NOAA / National Weather Service.