The official National Weather Service forecast for Galena — 40.2151°N, 82.8799°W, 2.8 miles from I-71.
| Delaware County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 40 | 50 | 63 | 73 | 82 | 84 | 83 | 78 | 65 | 52 | 41 | 62 |
| Avg low °F | 20 | 23 | 31 | 40 | 51 | 60 | 63 | 61 | 54 | 43 | 33 | 26 | 42 |
| Precip in | 2.7 | 2.4 | 3.2 | 3.9 | 4.5 | 4.6 | 4.2 | 3.6 | 3.3 | 2.9 | 2.7 | 3.0 | 41.0 |
1996–2025 normals for Delaware County — the climate division Galena sits in. All-time county record high 102.3°F (1988-06-26); record low -23.7°F (1994-01-19). Source: NOAA / National Weather Service.