From the January 6, 2016 issue of “Principals Weekly”:
Guidelines for Outdoor Play in Cold Weather ~ All Schools
Children benefit from vigorous exercise and should be given the opportunity to play outside whenever possible. Unless it is snowing, there is ice on the playground, or the wind chill factor creates an effective temperature below zero degrees Fahrenheit (-18 degrees Celsius), temperature alone should not be a barrier to outdoor play. You are encouraged to work with your staff to maintain outdoor play periods, and you should take precautions to keep students warm and ensure they are appropriately dressed on very cold days. When outdoors, please ensure your students and staff cover exposed skin, wear warm clothing and use multiple layers to maintain warmth. For more information please see the guide to staying warm outdoors from the NYC Department of Health and Mental Hygiene.