I commute an hour each way, in pacific northwest, pouring rain and a few degrees above freezing, with lots of hills to go up.

I manage to arrive dry and warm. I think thats a whole heck of a lot better than wet and warm as all the above posters recommend. Water resistant is resistant for about 20-30 min usually. I prefer waterproof for my jacket (showerspass elite) and wind proof for my legs.