The cold temperatures today call for layers and exposed areas like your ears and fingers to be covered. Due to the low temperatures, there is a Code Blue in effect until 8 a.m. Friday morning. 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 if the temperature outside is below 55 degrees, landlords should set the heat to 68 degrees from 6 a.m. to 10 p.m.