Extreme Cold/Wind Chill — Upper Green River Basin, Wyoming

2025-01-20 · Upper Green River Basin, Wyoming

Event narrative

Big Piney ASOS had several hours with apparent temperatures near or below -40 during the early morning.

Wider weather episode

An arctic air mass moved over Wyoming leading to early morning apparent temperatures falling into the -35 to -45 range for several basins.

Source: NOAA Storm Events Database, event_id 1229502. Narrative written by the NWS forecast office that issued the report.