[rsobin]

Liquid water on Mars might be a hard thing to catch up with. At zero degrees centigrade it’s ice. At 2 degrees centigrade it boils in the thin martian atmosphere.

[GraceG]

[ Liquid water on Mars might be a hard thing to catch up with. At zero degrees centigrade it’s ice. At 2 degrees centigrade it boils in the thin martian atmosphere. ]

Not if it is really really salty....

Then it is 4C