This winter has been very hard to ride. And it's not over yet... I have three bikes to choose from, so if one of my bikes breaks down, I just grab another one. All my bikes are fixed gear or singlespeed so that keeps maintenance to a minimum.
The bike that I've been riding this winter is going to need a new bottom bracket some time soon. It's getting very loose with lot's of play in it. It's an isis bottom bracket and they last me on average of 3 winters before needing replacement. One of my other bikes has a square taper bottom bracket and they last a lot longer then isis. I also put a new chain at the start of winter and it will need to be replaced in spring. So yeah winters are hard on bikes.