I've never heard of any tropical climate causing squibs. Squibs are most often the result of poor handloading technique.
The best way to keep a squib from ruining your world is to -STOP- shooting when something doesn't feel right, and don't take the next shot. A simple bullet lodged in a barrel is an annoyance, and little more. It doesn't end up being catastrophic until the follow-up shot is discharged.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.