I don't think you'll need to worry too much about that but prepare to bring something just in case.

[Tifa has a feeling that it won't be cold at all in the area, given how things tend to go between Tifa and Eustace, and on their wedding day? She wonders if the snow will even hold against their dreamotion, or the combined dreamotion of everyone there. She'll have to find some way to ensure that it does...]

But when we pick a date, you'll know.