The city is working to get homeless people shelter as temperatures dip and the city faces its coldest air of 2017.
With freezing conditions in the city Tuesday night and overnight, the Department of Homeless Services has issued a Code Blue warning.
That means outreach teams are scouring the streets to make sure people find shelter.
The city is asking New Yorkers to call 311 if they see anyone staying in the street.
During a Code Blue, the city's shelter system cannot deny anyone brought in by an outreach team, and will accommodate walk-ins.
Temperatures were in the mid-20s around 11 p.m. Tuesday night, but they are dropping.
With a southerly jet stream pushing cold air towards the city, wind chills are in the teens Tuesday night and are projected to dip into the single digits overnight.
The cold and winds will only become worse Wednesday, with a wind chill of 4 projected for 10 p.m. Wednesday, and 0 by 6 a.m. Thursday.
Flurries and a few snow showers may sprinkle the city Friday.
The frigid air is not expected to go away any time soon, as temperatures are projected to be below average and below freezing to begin 2018.