The official National Weather Service forecast for Mill City — 44.754°N, 122.4781°W, 26.8 miles from I-5. Forecasts here are written by NWS PQR, this county’s forecast office.
| Linn County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 44 | 46 | 50 | 56 | 63 | 70 | 80 | 79 | 72 | 60 | 49 | 43 | 59 |
| Avg low °F | 33 | 32 | 34 | 36 | 42 | 46 | 51 | 51 | 47 | 41 | 36 | 32 | 40 |
| Precip in | 9.9 | 7.7 | 8.2 | 5.9 | 4.3 | 2.6 | 0.4 | 0.7 | 2.5 | 6.0 | 9.6 | 12.0 | 69.8 |
1996–2025 normals for Linn County — the climate division Mill City sits in. All-time county record high 103.5°F (2021-06-29); record low -1.0°F (1990-12-22). Source: NOAA / National Weather Service.