There's huge variation in how cold your hands can get, so you really have to just keep trying things. I bought a pair of the PI lobster gloves a while back, and they were the next best thing to useless past -3C. I have been using the MEC Nanu gloves [get it? "Nanu-nanu!"]. They are good by themselves to about -20C, but quite warm when you get up to the freezing mark. I use fleece-lined pogies for anything around -20C or colder. They are the cat's ass in terms of keeping your hands warm and dry.