Bern, POC, Nutcase, Bell, and Giro all make skate-style bike rated helmets. I don't have any plans to use one, but that's because I don't have any issues with getting cold. I have a Smartwool beanie that fits under my helmets in cool weather, and a full balaclava if it gets really cold.
I've smacked the ground a few times in the winter in a regular roadie helmet and there wasn't anything unusually horrible about it that I felt like I needed additional coverage.