Re: North america to central/south america
North Americans generally 'winter' in the Caribbean... it's not quite the idyllic place in true 'summer'.... And in any event getting from East Coast Canada to South America in a month is not likely on a sailing vessel.
Best of luck in your quest but I fear you'll find few takers on that timetable...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)