I teach at a preK-8th grade parochial school. Our policy is we don't go outside if the temp with or without wind chill is below 32F.
Of course we just had a frigid couple of weeks and some kids came to school in shorts and sweatshirts (and it was near 0 for many mornings). These kids ALL come from money and can afford coats/gloves/hats, etc. Most of them have nicer coats than I do. They just don't want to wear it (unless they're skiing in Aspen and then by golly parents wouldn't think about complaining about the temperature).
IMO we're raising a bunch of pansies... and not just concerning the weather.

.