The official National Weather Service forecast for Geneva-on-the-Lake — 41.8595°N, 80.954°W, 7.1 miles from I-90.
| Ashtabula County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 37 | 46 | 59 | 70 | 78 | 81 | 80 | 74 | 62 | 50 | 39 | 59 |
| Avg low °F | 19 | 20 | 27 | 37 | 47 | 57 | 61 | 59 | 53 | 43 | 33 | 26 | 40 |
| Precip in | 3.0 | 2.4 | 3.0 | 3.8 | 3.9 | 4.4 | 4.1 | 3.8 | 3.9 | 4.2 | 3.3 | 3.4 | 43.2 |
1996–2025 normals for Ashtabula County — the climate division Geneva-on-the-Lake sits in. All-time county record high 97.4°F (1988-07-17); record low -24.2°F (2015-02-20). Source: NOAA / National Weather Service.