The Doctor has explained about the difference between summer and winter, and the ocean is a sight to behold.

"You were slightly off on your estimate of the start of winter." She's not criticizing, just teasing. To prove that, she leans her head against his arm, for just a second.

And, because she worries, and hasn't realized he knows about her head, "You have a hole in your shoulder. Once that has healed, I will feel better about your current state."

That also might translate to, he'll have to deal with a little bit of fussing until that is done.