One of the commonest species in northern climates, P. gelidus is found here in great numbers during the winter months. There is intense disagreement among authorities on the subject as to whether frost dragons are present year-round at this latitude. It is the author's belief that, as the Door peninsula is a dolomitic karst with numerous, if generally small, caves, it is quit possible (I would like to say probable) that they are able to hibernate here, so that at least part of the population is non-migratory.
There is also some debate as to whether the frost dragons of the southern hemisphere are of the same species. It seems likely enough that the seemingly separate populations may indeed intermingle. They are certainly capable of flying long distances, and cpuld easily ride cold high-altitude air currents. It would be very interesting to learn how much of this mixing takes place, but I doubt that a study is likely in the forseeable future.
Frost dragons are small, shy, and difficult to see. Dragonwatchers of many years experience seldom log a reportable sighting. It is frequenly best to attempt nighttime observation, though they may be active at any time if weather conditions and temperature are favorable. Since they have the ability to appear virtually invisible, you are unlikely to see more than what has been described as "a momentary swirl of glittering light". Needless to say, good photographs are extremely rare. I hope to obtain something better for the next edition.
Frost dragons are quite playful and gentle, and have never been known to harm a human. Do dress warmly if attempting to observe them outdoors. Perhaps the best way to see them is through a window, on a moonlit night. Make a cup of cocoa, turn out the lights, and get comfortable.