I thought he might be checking for ice, but it was well above freezing.
You guessed the right answer.
Even though it was above freezing it doesn't mean the fuel in the wing is, particularly if the aircraft has been on a prior flight. These cold fuel can chill the surfaces of the wing, drawing moisture out of the air causing condensation and then frost to form. This frost formation has been blamed for at least one MD
-80 loss, when it broke off and FOD'ed the engines.
When I was working for AS
in 94, they had a policy that if an MD
-80 sat on the ground fewer then a certain period of time (I forget how many hours) it had to be de-iced....regardless of the time of the year.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.