In Europe in February, it gets dark early, the days are short, and it's really cold.
「2月の○○は暗くなるのが早いし、ものすごく寒いでしょ?」= In Europe in February, (I suppose/ I think) it gets dark early, the days are short, and it's really cold.
※「I suppose/I think」は「~でしょう」という部分を表す
「2月」 = February
「暗くなるのが早い」= gets dark early
「日が短く」= the days are short
「ものすごく寒い」= really/very/extremely cold