The official National Weather Service forecast for Lake Tansi — 35.8728°N, 85.0544°W, 12 miles from I-40.
| Cumberland County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 44 | 49 | 58 | 67 | 74 | 81 | 84 | 83 | 78 | 68 | 57 | 48 | 66 |
| Avg low °F | 27 | 30 | 37 | 44 | 53 | 60 | 64 | 63 | 57 | 46 | 36 | 31 | 46 |
| Precip in | 5.0 | 5.5 | 5.4 | 5.2 | 5.0 | 5.1 | 5.3 | 3.9 | 4.4 | 3.4 | 4.4 | 6.0 | 58.6 |
1996–2025 normals for Cumberland County — the climate division Lake Tansi sits in. All-time county record high 101.9°F (2012-06-30); record low -21.6°F (1985-01-21). Source: NOAA / National Weather Service.