User blog comment:Royice/Theory on how Zeref know Natsu/@comment-168.212.207.12-20140110155845/@comment-7418318-20140116103051

You don't even need to look all the way over to Japan. Even in middle Europe April's still well within spring.

Last year it was even snowing until the middle of April over here (thought that was a big unusual), so from a weather perspective you could even have called it winter.