The official National Weather Service forecast for Blaine — 36.1542°N, 83.7041°W, 12 miles from I-40.
| Grainger County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 52 | 60 | 70 | 77 | 84 | 87 | 86 | 81 | 71 | 60 | 50 | 69 |
| Avg low °F | 27 | 31 | 37 | 45 | 53 | 62 | 66 | 65 | 58 | 46 | 36 | 31 | 46 |
| Precip in | 4.3 | 4.7 | 4.8 | 4.3 | 4.0 | 4.1 | 4.6 | 3.7 | 3.8 | 3.1 | 3.4 | 4.8 | 49.6 |
1996–2025 normals for Grainger County — the climate division Blaine sits in. All-time county record high 103.1°F (2012-07-01); record low -17.4°F (1985-01-21). Source: NOAA / National Weather Service.