I have a number of character on Wintersebb. It is one of the newer worlds that is in service and when it opened, we attempted to focus on it as an actual role-playing server. I became a member of the Order of the Dawn allegiance, an allegiance that specifically was geared toward role-players.
Wintersebb takes its name from the final month of winter on the Old Roulean Calendar. It can be associated with March, and it is when the weather starts to warm up. As far as I know, it is the only "winter" month used as a world name in the original Asherons Call.