I have a box that I've neglected and left outside for at least 3 years. I can tell you that they will survive outside. I'm in socal weather.
But I didn't like the boxes. The latches were sometimes hard to open/close and were not fun accessing in the cold with no gloves.
The plastic ones are hard. For $10 they sell replacement metal latches that are very easy to operate. Though they dont stay put quite as well when not latched (lid side).