A friend of the 19-year-old in the small town of Hessisch Lichtenau in Hesse told police that the young woman had left their shared apartment to go smoke a cigarette on Saturday night, but did not return.
She was reported as missing and found dead on Sunday. An autopsy reported on Tuesday found that she had in fact frozen to death.
“Why she froze to death, we do not know,” a police spokesman said.
A toxicology report must now determine whether she had medication, drugs or alcohol in her blood and what role that might have played in her death. Investigators have ruled out the possibility of any violent crime being involved in her death.
On the night she disappeared, temperatures fell between -8C and -11C in the region, and there had been a large amount of frost.
In Thuringia, a 61-year-old woman who had gone on a winter walk with her husband at the weekend was also found dead after she apparently had fallen and was seriously injured due to the heavy snow and ice. Her husband was found alive but hypothermic.