Dress in layers lay off the booze and bring some hand warmers.
In New York City it's expected to be one of the coldest ball drops on record, Sunday.
And as we count down the final hours of 2017, police around the world are working to make New Year’s Eve celebrations safe for everyone.
From Rome to Rio, Madrid to New York City.
Police in cities around the world are working to keep New Year’s Eve celebrations safe.
In Berlin, workers spent Saturday setting up barriers around the Brandenburg gate, where hundreds of thousands are expected to ring in the New Year.
Large bags and suitcases are banned from the event.
In Brazil, two million people are expected to attend a fireworks show on Rio's Copacabana beach. 2,000 officers will watch over the festivities from surveillance towers.
Tourists seemed more concerned about the weather, than security.
In New York, keeping two million people safe Sunday night is the top priority for the NYPD.
“This is going to be one of the most well policed, best-protected events, at one of the safest venues in the entire world,” said James O’ Neill, NYPD commissioner.
This month, a would-be suicide bomber tried to set off a bomb in a walkway under Times Square.
Now, all officers working New Year's Eve will have additional training with help in clearing crowds if they detect a threat.
Stopping the bomber with lethal force, treating the wounded if a bomb goes off.
Neither the threat of terrorism, nor the brutal cold seemed to lessen the crowds in Times Square Saturday.
The countdown to -the- countdown is on.