It's a good thing you didn't use Ed's name, I've heard he can teleport to your location and eat you for doing stuff like that :happy:
Anyway, I'm a little surprised as well. I wonder if the heat let the wax melt off and the rain wash it away?
My personal experience, being in 300% humid Mississippi is that oil coated blades will rust sitting in the garage (forget the rain) a little less than clean steel, and wax will keep just about indefinitely unless it's cleaned off. The other end of that and something that I'm going to have to figure out with my new little horizontal belt knife....it rides on my belt and my belly tends to rest on it occasionally like in a sitting position. The handle seems to rust a bit after a few weeks. My guess is becuase the heat of my body is allowing that wax to warm and wear away. Now that's with plain steel, wax coated. I wonder if bluing or acid etching will help that any.
Anyway, the only other thing I would mention is that 3in1 oil isn't foodsafe. I wouldn't want to cut my apple after using it on a blade. The wax is safe and I still think that sitting inside, or protected, a knife will last longer and be food safe with the wax. Perhaps that's something to consider.