Others use the “below measurable range” description as the primary characterization, without a specific numerical value.

The honest position is that the precise lowest core temperature that Jean Hilliard reached is not definitively documented.

The clinical descriptions are clear — she appeared to be frozen, she had a barely detectable pulse, she was rigid, her pupils were unresponsive.

The exact temperature that corresponds to this clinical presentation in her specific case is not established with the precision that would allow confident conclusions about exactly how close to the edge she came.

What is established is the clinical trajectory: she arrived in a state that appeared inconsistent with life, she was treated with external rewarming, and she recovered.