Heat — Wind River Basin, Wyoming

2025-12-01 to 2025-12-31 · Wind River Basin, Wyoming

Event narrative

It was a record warm month at the Riverton airport. The December average temperature of 35.3 degrees beat the old record of 29.8 degrees set in 2021. The period of record dates back to 1996.

Wider weather episode

Persistent ridging across the northern Rockies brought record warmth to western and central Wyoming for December. Many airports with a 20 to 30 or more year period of record had the warmest December on record. Most sites were at least 10 degrees above normal for the month, with Riverton running more than 15 degrees above normal. Numerous high temperature records were set throughout the month.

Source: NOAA Storm Events Database, event_id 1307802. Narrative written by the NWS forecast office that issued the report.