The official National Weather Service forecast for Clay — 38.4604°N, 81.0851°W, 8 miles from I-79.
| Clay County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 47 | 57 | 68 | 75 | 82 | 85 | 84 | 79 | 68 | 57 | 47 | 66 |
| Avg low °F | 24 | 27 | 33 | 41 | 51 | 59 | 63 | 63 | 56 | 45 | 34 | 28 | 44 |
| Precip in | 3.4 | 3.4 | 3.8 | 4.0 | 5.0 | 4.9 | 5.3 | 4.1 | 3.5 | 3.3 | 3.0 | 3.5 | 47.2 |
1996–2025 normals for Clay County — the climate division Clay sits in. All-time county record high 101.2°F (1988-07-17); record low -20.1°F (1994-01-19). Source: NOAA / National Weather Service.