Different season, same kids

I'm sure some of you heard about Tropical Storm Andrea coming through recently. Thankfully, we didn't get much except for a few thunderstorms. 
Before I continue, I have to tell you about this kid that joined us in February. He's gotten better, but he literally does the opposite of everything you tell him to do. If he's already on his way to wash his hands and someone reminds him that when he does, he'll be able to eat/play, he'll stop and turn around. If we tell him to stay on his mat during quiet time, he'll try to run around the room. One of the biggest problems we have is getting him to come inside after being outdoors. We warn him, we hold his hand, and this tactic usually works.  Lately he's been really good about coming inside on his own.
So, tropical storm Andrea. After ten minutes of being outside, it started to rain. It wasn't a big deal until the rain came down harder and we could hear thunder.  Everyone was in line except...yep. That kid. He retreated to the structure, wrapped in a towel, and didn't move.  I told my assistant to take the others inside while I talked to him.  I approached slowly, as someone would approach a wild animal or a skittish rabbit. Thankfully, he didn't bolt. I told him to come inside and he said, "But I'm cold!"
That's right; he didn't come in from the rain because he was cold. I have a lot of work to do with him.