The hazard here is the rain - we only get rain in the winter, and each year, when the rains first start, people take no heed of it as they're driving and we seem to have a bunch more accidents on the road. I describe those early rains as "stupidity falling from the sky."

I think that is generally true for any seasonal change. The first days of winter driving are always treacherous here, until you get used to leaving more distance to stop, remembering not to drive in the ruts, not spinning your tires when starting at a red light, don't brake during a turn (which you can otherwise get away with) etc., etc. I personally HATE winter driving, whether I'm used to it or not!