Extreme Cold/Wind Chill — North Big Horn Basin, Wyoming

2023-01-29 to 2023-01-31 · North Big Horn Basin, Wyoming

Event narrative

Low temperatures fell below minus 30 in several locations, including minus 34 at the Greybull Airport and minus 34 in downtown Greybull.

Wider weather episode

The combination of an Arctic air mass, a clear sky, light wind, and deep snowpack brought record cold temperatures to most of western and central Wyoming. Most of the coldest temperatures occurred in the snow covered basins where low temperatures of minus 30 were commonplace with some areas seeing low temperatures less than 40 below zero. The coldest temperature in the forecast area occurred in Yellowstone Park where Grant Village feel to minus 47 degrees on the morning of January 30th. Wind chills were in the 30 to 40 below range for most basins.

Source: NOAA Storm Events Database, event_id 1078204. Narrative written by the NWS forecast office that issued the report.