Extreme Cold/Wind Chill in Upper Green River Basin Foothills, Wyoming

Temperatures fell to -25 in many locations. The coldest location was Bondurant where the temperature dropped to minus 33 on December 8th and -37 on December 6th.

A combination of deep snowpack, a clear sky, light wind and an arctic air mass brought extremely cold temperatures to portions of western and central Wyoming. Low temperatures of -25F or below occurred in Sublette, Natrona and Lincoln Counties as well as in Yellowstone Park. The low temperature at the Casper airport on the morning of December 8th was especially noteworthy since it was the 6th coldest temperature ever recorded and the coldest since December 1990.