The official National Weather Service forecast for Iron Mountain — 45.8202°N, 88.066°W, population 18,336, 159.8 miles from I-75. Forecasts here are written by NWS MQT, this county’s forecast office.
| Dickinson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 23 | 28 | 38 | 51 | 66 | 75 | 80 | 77 | 70 | 56 | 41 | 28 | 53 |
| Avg low °F | 6 | 5 | 15 | 27 | 39 | 50 | 54 | 52 | 46 | 35 | 24 | 13 | 30 |
| Precip in | 1.3 | 1.2 | 1.7 | 2.9 | 3.1 | 3.7 | 3.3 | 3.0 | 3.2 | 3.1 | 1.9 | 1.7 | 30.1 |
1996–2025 normals for Dickinson County — the climate division Iron Mountain sits in. All-time county record high 99.8°F (2026-07-14); record low -35.7°F (1996-02-03). Source: NOAA / National Weather Service.