I live in Minnesota. I keep pipes in my car. In the summer, tins will heat up, pop the seal causing tobacco to dry out, so keep minimal tobacco in the car and/or find a way to secure the lid. Not a problem with screw top lids, biggest problem with c&d style cans, I slide a zip tie on my square tins to hold em shut.
I try to let my pipes rest and dry for about 24hrs after smoking them to keep em smoking nice, in the summer when it is hot and humid they need ~36-48hrs.
But one winter morning I got in the car to go to work, started it, packed a pipe and lit it with a match to try and warm up. A few minutes later I noticed the acrylic stem had cracked. So in the winter, be careful with your lighting. And let your pipes warm up a bit, I just hold them in my hand until they're not quite so cold and blow through them a bit.