The official National Weather Service forecast for Mount Pleasant — 40.1754°N, 80.7979°W, 7.9 miles from I-70.
| Jefferson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 40 | 50 | 62 | 72 | 80 | 83 | 82 | 76 | 64 | 52 | 41 | 62 |
| Avg low °F | 21 | 23 | 30 | 39 | 49 | 58 | 62 | 61 | 54 | 44 | 34 | 26 | 42 |
| Precip in | 3.0 | 2.7 | 3.2 | 3.8 | 4.3 | 4.6 | 3.9 | 3.9 | 3.5 | 3.1 | 2.7 | 3.0 | 41.7 |
1996–2025 normals for Jefferson County — the climate division Mount Pleasant sits in. All-time county record high 99.4°F (1988-07-08); record low -22.0°F (1994-01-19). Source: NOAA / National Weather Service.