The official National Weather Service forecast for Rocky Top — 36.2179°N, 84.1547°W, 1.9 miles from I-75.
| Anderson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 51 | 61 | 70 | 77 | 84 | 86 | 86 | 81 | 70 | 59 | 50 | 68 |
| Avg low °F | 28 | 31 | 38 | 45 | 55 | 62 | 66 | 65 | 59 | 47 | 37 | 31 | 47 |
| Precip in | 5.2 | 5.7 | 5.1 | 5.1 | 4.4 | 4.5 | 5.1 | 4.2 | 4.2 | 3.5 | 4.4 | 5.9 | 57.3 |
1996–2025 normals for Anderson County — the climate division Rocky Top sits in. All-time county record high 103.4°F (2012-07-01); record low -17.6°F (1985-01-21). Source: NOAA / National Weather Service.