Perhaps the greatest attraction is the presence of the real monsters, the fish which, for a lot of the year, spend their time being nocturnal or feeding in the depths. For some reason (perhaps the duller light or the location of easy prey?) these really big trout seem to be more visible through winter, presenting more chances – if not guaranteed captures!
So don’t worry about the weather, put on some of that great outdoor gear (see, there is at least one advantage of living in the modern age) and head out for a cast and a chance at a beauty.