Monday begins a new year—2018— and it is also Inauguration Day in New York City. Unlike the mid-day presidential inauguration of January 20th, New York mayors traditionally begin their terms at 12:01 a.m. on January 1st. For an incoming mayor, this often means holding a private swearing-in at midnight, followed by a public ceremony the next day. For an incumbent mayor there is no need to transfer duties, but the mayor still has a swearing-in ceremony to begin the next term. Depending on weather conditions these have been large outdoor affairs or smaller indoor ones.