We did the Nov. east to west crossing of the Liberty this year. Hit a couple days of less than perfect seas, but other than that it was a great trip.
Two years ago we did a west to east crossing in the spring, and the seas all the way over were calmer than a bathtub. Also a great trip!
The seas however are unpretictable. And the conditions vary, so nothing is guaranteed.
Europe and the med in either spring or fall are WONDERFUL!!