I’m not sure whether I’ve seen sea smoke in December before, but it is close to January. With bonus of Jack Frost on the window.

Accuweather

Sea smoke is essentially just fog above water, according to AccuWeather Senior Meteorologist Dave Samuhel. The occurrence of sea smoke is similar to the steam that appears over a boiling pot of water or a hot bath.

“It happens when the air mass is so cold it makes the water steam like a pot on a stove would,” Samuhel said. Sea smoke is also sometimes referred to as arctic sea smoke, frost smoke, steam fog or sea fog.

In order for sea smoke to occur, the air has to be very cold and the water has to be comparatively warm. As a light wind of cold air sweeps in, it cools the warm air immediately above the water, which makes the air dip below the dew point. The air is only able to hold so much moisture before it condenses into fog, or sea smoke.