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.
[ Liquid water on Mars might be a hard thing to catch up with. At zero degrees centigrade its ice. At 2 degrees centigrade it boils in the thin martian atmosphere. ]
Not if it is really really salty....
Then it is 4C