I have seen a few "stored" in hot places old machines. I recommend storing it in a case. Maybe you can find a mid century painted machine - the old black machines including the featherweight have shellac finish and that finish will crack from extreme temp variations. When you store it have it cleaned and oiled. Don't store thread in the bobbin - well at least around here. Another suggestion would be to buy a vintage high end machine locally when you get there. You can always resell it when you leave and buy something else next year. There are people who refurb machines and sell them on Craigslist and if you watch you could find something but you might ask if they have refurbished it - some don't advertise that they have been refurbished.