More info is needed.
Traveling west to east or east to west?
Sailing to/from New York or a southern port?
If New York is involved, you can anticipate cold weather and potentially rougher sees, due to the northern route.
If Miami, Fort Lauderdale, or even South America, it's a whole different story. Seas may or may not be calmer, depending on Mother Nature's mood. You will need to pack cold weather and warm weather clothes.