Heat — East Sweetwater County, Wyoming

2025-12-01 to 2025-12-31 · East Sweetwater County, Wyoming

Event narrative

It was a record warm December at the Sweetwater County airport. The average temperature of 35.6 degrees beat the old record of 32.2 degrees set in 1980. The period of record dates back to 1948.

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 1307806. Narrative written by the NWS forecast office that issued the report.