we were in Rochester (NY) during December once and tried to get to Niagra, but it was snowed in. Just have to be aware of the ever changing weather conditions up there. We eventually went back in October, a couple of years later, and it was gorgeous.I'll be in America (mainly the east coast) since early December so hopefully I'll be used to the freezing cold. Me and my mate were always planning on visiting Niagra, and we decided we might as well make a small trip of it across to Canada, so the original point of going to Toronto was to check out Niagra.
The CNN tower is down on my to do list now though. Cheers.