My yacht club accepts new members year round. You do not need wait a year to join but slip availability is based on seniority and boat size. If you joined my YC now (4k initiation) you would most likely have a slip to use next season give your boat size. Seems like many are moving up to big boats (35-50ft). The most difficult boat size to accommodate is 35-39ft due to slip configurations.
Good point, I meant to say a waiting list for the slip. They said they would gladly take my initiation/dues/etc now with a slip in 1 or 2 years Then I still have to get a slip this year and possibly next. I bought my boat from a seller who was a YC member in N Weymouth and I really liked the club and location. Also I did find a few clubs that are just moorings -- but see above