re: Mars Ice Crater
Great photo showing water ice at 70 degrees north latitude. Temperatues near the south pole at 70 degress south latitude can exceed 0 C. See the animated temperature plot here:
www.Mars-Ice.org : The South Pole in 1999.
http://www.mars-ice.org/sp99.php
However I don't know if they can get that high at this far north latitude. It is notable though at this high northern latitude the atmospheric pressure is among the highest on the planet, because of the overall south to north downward slope.
Bob Clark