Idaho weather in January
One place stands in for Idaho here — these are Boise's numbers, not a statewide average.
Based on 1 weather station, in Boise. One station — Boise sits in the state’s warm southwestern valley, so the mountain towns and the panhandle run colder and snowier than these rows.
Boise & the Treasure Valley
Highs near 39°, nights around 26°, and 5.3 in of snow in a typical January.
| Place | Highs / lows | Wet days | Snow | The short version |
|---|---|---|---|---|
| Boise | 39° / 26° | 5 | 5.3 in | Cold, gray, and lidded — the valley traps its own air. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.