The official National Weather Service forecast for New Martinsville — 39.6445°N, 80.8576°W, population 5,608, 29.7 miles from I-70.
| Wetzel County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 43 | 53 | 65 | 74 | 81 | 84 | 83 | 78 | 66 | 54 | 44 | 64 |
| Avg low °F | 22 | 24 | 31 | 40 | 49 | 57 | 62 | 61 | 54 | 43 | 32 | 27 | 42 |
| Precip in | 4.0 | 3.3 | 4.0 | 4.2 | 4.8 | 5.0 | 4.7 | 3.9 | 3.7 | 3.4 | 3.1 | 3.8 | 47.9 |
1996–2025 normals for Wetzel County — the climate division New Martinsville sits in. All-time county record high 100.4°F (1988-07-17); record low -25.3°F (1994-01-19). Source: NOAA / National Weather Service.