The official National Weather Service forecast for Alderson — 37.7259°N, 80.642°W, 10 miles from I-64.
| Greenbrier County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 43 | 52 | 63 | 71 | 77 | 80 | 79 | 74 | 63 | 52 | 43 | 61 |
| Avg low °F | 21 | 24 | 30 | 39 | 47 | 55 | 59 | 58 | 52 | 41 | 31 | 25 | 40 |
| Precip in | 3.7 | 3.5 | 3.7 | 4.2 | 5.1 | 4.7 | 4.7 | 3.8 | 3.8 | 3.1 | 3.0 | 3.6 | 46.9 |
1996–2025 normals for Greenbrier County — the climate division Alderson sits in. All-time county record high 94.4°F (1988-07-17); record low -22.7°F (1985-01-21). Source: NOAA / National Weather Service.