There are totally cities in those places. And there is nothing wrong with him wearing the suit in a warmer city, at least until his wife can be cured and he can find a way to be able to survive in a warmer-than-freezing city more easily. Saying it's okay for him to freeze over an entire city is like saying "there's someone with a food allergy in this city, so it is now illegal to own that food", as opposed to taking reasonable measures. If he doesn't want to wear his suit... he can travel somewhere colder when it's not winter where he wants to live the rest of the time, he can stay in chilled rooms indoors, but he should not freeze over an entire city without the consent of the rest of its residents. Also, I do not understand the physics of Freeze's plan... if he just threw in snow, it would not stay cold long and then the entire city would be quite flooded and he still wouldn't be able to walk around sans suit after not so very many hours.