The official National Weather Service forecast for Wellsville — 38.7183°N, 95.0816°W, 1.4 miles from I-35.
| Franklin County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 45 | 57 | 67 | 76 | 85 | 89 | 88 | 81 | 69 | 56 | 44 | 66 |
| Avg low °F | 21 | 24 | 35 | 44 | 55 | 64 | 69 | 67 | 58 | 46 | 35 | 25 | 45 |
| Precip in | 1.2 | 1.5 | 2.5 | 3.7 | 5.7 | 5.3 | 3.8 | 4.1 | 3.8 | 3.5 | 2.1 | 1.5 | 38.7 |
1996–2025 normals for Franklin County — the climate division Wellsville sits in. All-time county record high 111.8°F (1954-07-14); record low -20.1°F (1989-12-23). Source: NOAA / National Weather Service.