My MIG welder is set up for gas, I have 2 bottles, and 2 whips. I can set my welder up to weld steel or aluminum. Its primarily used in my shop, I don't take it outside unless I am welding on something that wont fit threw the door. But you have to be careful if you use gas, if its breezy out you will get bad welds. Flux core would work best if you are going to be welding outside. I have a stick welder that I usually weld outside with, it really doesn't matter what the weather is like. I welded for a construction company a few years back and we would weld in all weather; windy, raining, cold, and snowing. It really didn't matter much, the welds still came out good.