Mind you if you get into the colder temperatures, -10 and below, you can suffer a broken mech box. We (BCAC) had a bootcamp last winter that resulted in a few breaking.
As far as rust goes, use a small spritz of silicone oil on any steel bits (after it's dried) and it'll stop it, wipe off the excess.
Otherwise like everyone else has stated, these things are pretty resilient.
Paul / Whozat