The official National Weather Service forecast for Clayton — 35.6507°N, 78.4564°W, population 51,898, 6.2 miles from I-40. Forecasts here are written by NWS RAH, this county’s forecast office.
| Johnston County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 53 | 57 | 64 | 74 | 80 | 87 | 90 | 88 | 83 | 74 | 64 | 56 | 72 |
| Avg low °F | 31 | 34 | 40 | 48 | 57 | 66 | 70 | 68 | 62 | 50 | 40 | 34 | 50 |
| Precip in | 3.5 | 3.2 | 3.7 | 3.6 | 3.9 | 4.2 | 5.5 | 5.4 | 5.9 | 2.9 | 3.2 | 3.7 | 48.7 |
1996–2025 normals for Johnston County — the climate division Clayton sits in. All-time county record high 104.6°F (1952-07-22); record low -3.9°F (1985-01-21). Source: NOAA / National Weather Service.