I believe you'll find what is in the POH (proper) is the maximum demonstrated crosswind, not a *limit*.
I don't know what rules apply elsewhere but here in Sweden it's actually expressly forbidden to start or land if the crosswind component exceeds the maximum allowed or demonstrated as specified by the POH. LFS 2007:58 if anybody wants to look it up.
In my view, if the crosswind is just at the limit of what's allowed, or what the club rules say, or what you personally feel comfortable with, then don't fly. It might get better but it might also get worse.