With ideal conditions, temperatures plummeted to lows colder than they have been since early February 2011 in much of the Star Valley area.  Following is a list of recorded minimums around the area this Thursday morning beginning with the warmest.

Willow Creek Snotel 8400′          4
Salt River Summit     7600′          4        
Star Valley Ranch                      -8
Alpine                                       -13
Bedford                                    -14
Smoot                                       -15
Etna ES                                     -16
Thayne ES                                 -17
Afton                                          -18
Box Y                                        -20
Etna 2NW                                  -21
Etna 2NE                                   -23
3N Cokeville                              -25
and the coldest unofficially was  -28 near Auburn.

Here is a photo of a temperature taken on a truck sensor this morning near Auburn

 Continued mostly clear skies, light winds and snow cover assure a couple more cold night.

Riverton Forecast Office has issued a weather briefing into early next week.

http://www.crh.noaa.gov/riw/?n=weatherbriefing