I can only assume that they meant air temperature of more than 0.
It was a shame that the two-crew operation was not mentioned from a flying perspective. In particular, the program seemed to indicate captains did all the flying, and you had to ask yourself what that other bloke was doing in the LHS - since it was not mentioned. Perhaps it was the editing which is at fault, since having been in MU, that was not the impression I had of the cockpit, and interaction between captain and f/o. (I missed the first 5 mins, so perhaps it was explained then).
Wouldn't it make better TV than that dreadful airport program, or the one about that dreaful airline.