The official National Weather Service forecast for Millersport — 39.9001°N, 82.534°W, 11.5 miles from I-70.
| Fairfield County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 41 | 52 | 64 | 74 | 82 | 84 | 83 | 78 | 66 | 53 | 42 | 63 |
| Avg low °F | 21 | 24 | 32 | 41 | 51 | 59 | 63 | 61 | 54 | 43 | 33 | 26 | 42 |
| Precip in | 2.9 | 2.7 | 3.5 | 4.1 | 4.5 | 4.5 | 4.4 | 3.5 | 3.0 | 3.0 | 2.8 | 3.2 | 42.1 |
1996–2025 normals for Fairfield County — the climate division Millersport sits in. All-time county record high 100.6°F (2012-07-08); record low -25.6°F (1994-01-19). Source: NOAA / National Weather Service.