Anyone who's telegenic looks great onscreen. If you want to be a TV meteorologist, you'll need to study a lot of science, but you'll also have to be telegenic.
Some people are telegenic because they're just so attractive, with a physical appearance that appeals to most viewers. Others just seem to have a charismatic way of relating to the camera that makes them suited to being on television (or in movies or videos). Most newscasters and movie stars are undeniably telegenic. The word telegenic was coined in 1937, a combination of television and photogenic.