Glaciers, on the other hand, can be counted on to be pretty consistent - any time you spend in front of one is going to be cold. Glaciers develop their own climate and winds. As you approach particularly large ones like Hubbard Glacier in Yakutat Bay, the winds blow down over the ice and directly across the deck of the ship. Bring your mittens because you will standing beside the largest air conditioner in North America!
The best you can do is be prepared for both the sun and the rain and be happy if you never have to put your rain gear on!