I have some orchids that need to be repotted now, but I do not know if should wait to warmer days. In addition, does the plant have to be in a dormant stage?
Do you know what kind of orchids you have? Most houseplant orchids are repotted after they finish blooming, but before the first new leaf of the year gets very far out. Sometime between those two events, although any time of the year that they need it often works fine.