Weather impact the Humor sense?

Yes, GEORGE R.R. MARTIN said it in A GAME OF THRONES through Ned's mouth.

"They say it grows so cold up here that a man's laughter freezes in his throat and chokes him to death," Ned said evenly. "Perhaps that is why Starks have so little humor."

It's a book I started reading months ago, but only finish tenth of it, too thick.

On the preface it said "this is for Merlinda". I wish I could have one for my family one day.