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I forgot to mention earlier...you do know, I hope, that the site you visit a lot...familysearch.org...is simply the Ancestral files of the LDS...and, as such, very filled with provable errors...so, take what you find there as a clue only, and don't accept anything there as fact. Far better to rent the filmed records they offer, which is the real strong point of the LDS...certainly not the Ancestral files.
I doubt sea travel in the south Pacific has any likeness to Atlantic travel, in ANY month, let alone in the ships used to come to the New World. The Welcome, that brought Wm Penn to PA set sail the last of August, and arrived in Oct, so it's fairly safe to say that most voyages took around this amt of time. The trips were arduous, and a good percentage of the passengers succumbed to various diseases, the hardest hit being the young and the old. There was an outbreak of small pox aboard the Welcome, and 30 some people died....that's 30 out of around 100...a terrible price to pay to emigrate.