I should not talk in class why it snows because it is not appropriate and on topic. If I said it in English I could tell, however, saying that this statement in Polish this could prove to be simply redundant. Interrupt a lesson, saying that could upset the teacher and prevent him from teaching us this beautiful language. Such behavior is irresponsible and unacceptable during the lesson. I could just as well say that it is snowing and fellow colleagues at the break.