The official National Weather Service forecast for Mifflin — 40.7739°N, 82.3643°W, 2.3 miles from I-71.
| Ashland County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 38 | 48 | 61 | 71 | 80 | 83 | 81 | 76 | 63 | 50 | 39 | 60 |
| Avg low °F | 19 | 20 | 29 | 38 | 48 | 58 | 61 | 59 | 52 | 42 | 32 | 25 | 40 |
| Precip in | 2.7 | 2.5 | 3.0 | 3.6 | 4.3 | 4.6 | 3.9 | 3.6 | 3.3 | 3.2 | 2.5 | 2.9 | 40.1 |
1996–2025 normals for Ashland County — the climate division Mifflin sits in. All-time county record high 99.6°F (1988-07-08); record low -25.4°F (1994-01-19). Source: NOAA / National Weather Service.