From my back windows, I look down the bank onto the river. In all seasons, ducks are up and down, mallards mostly, but not exclusively. The last few years we've even had a few Canadas, since the sandbar on the far side grew larger.
Ducks in winter *think* differently than ducks in summer. First, there's no gender between them in the winter. Groups are random, without regard to male and female...at least that's what I've noticed. Secondly, ducks are happy in the winter. The colder it is, the happier they seem. And bring on sleet along with the frigid wind, they're in a joyous tizz-dizz.