Waterblessing does not give protection from cold. Which is good since it's arguable the best blessing already.
While heat/cold scale doesn't affect sea provinces they will have an impact on you when you leave the water. Plan accordingly.
If you want to rely on cold spells for damage then use icedrakes and similar summons to provide a screen for your mages.
[ January 29, 2004, 15:55: Message edited by: Wauthan ]