What may be the first of three snowstorms this week dropped more than six inches of snow in parts of the city.
There are slippery conditions throughout the five boroughs and it's expected to get worse as temperatures drop overnight.
The National Weather Service reported eight inches of snow in Central Park, breaking the six-inch record for today's date, set in 1996.
In a press briefing Monday afternoon, Mayor Bill de Blasio said that the city's salt spreaders and plows are out in full force.
He urgued New Yorkers to use mass transit to lessen traffic congestion so Department of Sanitation crews can clear the roads.
"I can say to my fellow New Yorkers, things are going to be messy today," de Blasio said. "Snow is coming down faster than we can plow it. We have a very aggressive plowing operation going on, but the snow is coming down very rapidly in some areas of the city, already five inches of snow on the ground or more."
To view real-time snow plow locations, visit nyc.gov.
Alternate side parking is suspended through Tuesday, but drivers still have to feed the meters.
Hundreds of flights were delayed or canceled due to the snow.
Delays at LaGuardia were up to three hours at the height of the storm.
Crews worked throughout the day to clear the runways, even as the snow kept coming down. Almost six inches of snow fell near the airport.
Commuting was not any better. It was a messy subway ride home for commuters on the A, Q, 2, 3, 5, and 6 lines. They all faced delays or had to be rerouted.
The snow began as a wet mix this morning, making things messy for Super Bowl revelers looking to get out of town and those trying to get to work and school.
This is the first of three snowstorms expected to the city this week.
A winter storm watch is in effect overnight Tuesday into Wednesday.
The third storm is expected to arrive this weekend.
"We are actively addressing this storm while preparing for the next two," de Blasio said.
In Monday's briefing, de Blasio addressed concerns about his administration's response to the last snow storm.
"We felt very good about the response to the first storm January 2, and then, the response to the last storm obviously left something to be desired, so we did a review of our efforts, and we've come up with some initial changes that we were able to implement right away."
Those reforms include canceling trash collection, more communication between departments and a new routing system for snow removal.
De Blasio asked everyone to call 311 with any snow-related problems and to use 911 only in a true emergency.
Some of the biggest problems with the storm happened on Staten Island.
On Bard Avenue in Sunnyside, a steep hill proved impassable for cars.
Snowplows and salters had trouble getting up the hill, even with chains on.
In past years, residents say Bard Avenue was one of the first to be plowed, but this year, they say they didn't see a plow for hours.
"It's a hospital street, and nobody has come to plow, and you would think that ambulances have to go up the block here," said one resident.
Web Extra: Watch the full press conference
TWC News: Snow Alert in Effect as Winter Storm Causes Messy Commute
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