The official National Weather Service forecast for Gaston — 40.3139°N, 85.5005°W, 5.3 miles from I-69. Forecasts here are written by NWS IND, this county’s forecast office.
| Delaware County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 35 | 39 | 50 | 63 | 73 | 82 | 84 | 83 | 78 | 66 | 52 | 40 | 62 |
| Avg low °F | 20 | 23 | 31 | 40 | 51 | 60 | 63 | 61 | 54 | 44 | 33 | 25 | 42 |
| Precip in | 2.7 | 2.4 | 3.4 | 4.1 | 4.4 | 4.7 | 4.1 | 3.6 | 3.0 | 3.1 | 2.8 | 2.8 | 41.1 |
1996–2025 normals for Delaware County — the climate division Gaston sits in. All-time county record high 103.8°F (2012-06-29); record low -24.8°F (1994-01-19). Source: NOAA / National Weather Service.