Does water freeze in below 0 temperatures.

[ArguedPiano]

As topic says: does standing water freeze in temperatures below 0°c?

I usually play in boreal forest biomes, and in the past I thought I remembered shallow and deep water freezing over (apparent by snow collecting on top). You can see this happening with marshy soil.

I noticed my past few playthroughs this was not the case. The water stayed open in winter at -30°c temperatures. I don't know if I remember incorrectly or if a mod is potentially causing issues.

[The Man with No Name]

I don't think so. I was thinking a couple of days ago that this could be added to the game now rivers are a part of it, to prevent rivers being used as impassable defensive barriers.

[Hans Lemurson]

Ice terrain never melts and water terrain never freezes.  Any terrain that is "land" will accumulate snow in winter.  A marsh will get covered in snow, but never becomes icy.