Hmm. Carbon dioxide solidifies at -78.5 C at normal pressure. Omyakon is 750m from the sea level though, and Vostok station at 3500 m. Those temperatures are

Hmm. Carbon dioxide solidifies at -78.5 C at normal pressure. Omyakon is 750m from the sea level though, and Vostok station at 3500 m. Those temperatures are still getting close to that.