Greetings,
I believe the information about the snow is correct. Precipitation only shows up as rain. As for the icebergs, they are out there. I've been playing SH3 for a little over two years, almost always have a patrol going, and I just saw my first bergs in the last two weeks. Just north of Iceland they showed up on the map as a small slow moving convoy. Once I got into visual range, my jaw dropped