Baltimore will be cold in February. Charlestown should be a little warmer but still should warrant cool weather clothing. The further south you go the warmer it will be. However, that being said, I pack long pants, more long sleeve dress shirts, short sleeve polo shirts. My wife wears capri’s, jeans, long sleeve blouses, and always has at least a light sweater.
Similar to Alaska cruises, dressing in layers is usually the key.