The official National Weather Service forecast for Winchester — 38.9417°N, 83.6508°W, 40.2 miles from I-71.
| Adams County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 45 | 55 | 67 | 75 | 83 | 86 | 85 | 80 | 68 | 55 | 45 | 65 |
| Avg low °F | 23 | 26 | 33 | 41 | 51 | 59 | 63 | 62 | 55 | 44 | 33 | 27 | 43 |
| Precip in | 3.4 | 3.4 | 4.1 | 4.6 | 5.0 | 4.7 | 4.6 | 3.4 | 3.5 | 3.4 | 3.0 | 3.6 | 46.7 |
1996–2025 normals for Adams County — the climate division Winchester sits in. All-time county record high 103.6°F (2012-07-08); record low -25.3°F (1994-01-19). Source: NOAA / National Weather Service.