Lowest temperature endured by a bipedal robot

The lowest temperature endured by a bipedal robot for a sustained period of time is -22 C (-8 F). This feat was achieved on 30 January 2019 by Cassie Maize & Blue, a bipedal robot built by Agility Robotics and operated by the University of Michigan (both USA).

This test was conducted to see how Cassie's mechanical systems, electronics and batteries coped with exposure to very low temperatures. The ability to endure more extreme environments than humans is a common feature of fictional robots, but their real world counterparts typically struggle in anything other than optimal conditions.

Cassie managed to remain functional – pacing back and forth and walking on the spot – for over an hour before collapsing. A exposed human would likely start experiencing frostbite and the early stages of hypothermia in less than half that time. The robot's operators had expected its batteries to fail first – losing charge in the extreme temperatures – but they were found to be at around 60% charge at the end of the test. It is still not clear what caused Cassie's eventual collapse.