The cold temperatures today call for layers and exposed areas like your ears and fingers to be covered. There was a Code Blue in effect until 8 a.m. The city wants residents to call 311 if you see a homeless person sleeping on the street. They'll come to pick them up and bring them to a shelter. Residents can also call 311 if there is no heat or hot water in the building. In New York City, landlords should set the heat to 68 degrees from 6 a.m. to 10 p.m. if the temperature outside is below 55 degrees.