I don't believe this has been aknowledged, but I went to look at some quotes for Wolfgang after reading some information and quotes from the page, and I'm almost positive Wolfgang doesn't like the cold necessarily, but has a fear, or a past issue with, fire. The only proof of him enjoying the cold (correct me if I'm wrong) is that he says "Blue go up! Red go down!" or something along those lines when examining a winterometer, and that could be quite a few things, or even just an unintelligent comment. He also warns himself upon examining a fire dart (the other darts he only comments on the use) and when a fire is high he says it's too high. I don't really think this is a coincidence. I mean, it seems like he isn't afraid of it in some situations, but I would think that is due to his fear of the dark... any problems with my reasoning I would like to hear and am open to, otherwise I'd say he has a fear of fire.