What to Know Another winter storm dumped heavy snow across the tri-state, with some areas seeing more than a half-foot of the white stuff

The hardest hit was Armonk in Westchester County, which saw 11 inches of snow; Central Park saw 5 inches while NJ's Cedar Grove had 9.2

Some snow could stick around during the week; Tuesday temps fall below freezing, with Wednesday's expected to drop into the 20s

The third winter storm in several days has come and gone, but not before dumping close to a foot of snow on parts of the tri-state, Storm Team 4 says, making for a difficult Monday morning commute and closing many schools.

Public schools in New York City were closed Monday due to the storm, Mayor de Blasio announced. Hundreds more around the region were either delayed or closed Monday; see a full list of school closings here.

Public schools in New York City were canceled Monday due to the storm, Mayor Bill de Blasio annouced. See a full list of school closings here.

Light snow started falling Sunday evening, but the heaviest fell overnight just before Monday's AM rush, with some areas seeing snowfall rates of 1-2 inches per hour. All drivers were being urged to stay off the roads for plowing.

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By 10:15 a.m., parts of the tri-state area had a foot of snow, according to the National Weather Service. Monroe, in Connecticut's Fairfield County, had 12 inches of the white stuff. New York's highest total was in Westchester County's Armonk, which saw 11 inches. In New Jersey, Cedar Grove in Essex County saw the most (9.2 inches). Central Park saw 5 inches while Bayside, in Queens, had 7.1 inches. Parts of Suffolk County saw more than a half-foot while the Bronx, Brooklyn and Staten Island maxxed out at 3 inches, according to the National Weather Service. Click here to check how much fell in your neighborhood.

Meanwhile, New Jersey Gov. Phil Murphy issued a state of emergency for all of New Jersey. He said the Department of Transportation activated 2,500 plows and salt spreaders to keep state highways clear.

New York City had 695 salt spreaders on the street and 1,600 plows ready before the flakes started falling, the mayor said.

Hundreds of flights in and out of New York City's three major airports were canceled and delayed, according to FlightAware.com. At Newark, more than 150 flights were canceled; LaGuardia and JFK airports each had about 100. Falling ice forced a shutdown of the Verrazzano Bridge's upper level at the height of rush hour. Get up-to-the-minute commute updates here.

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Much of the snow is expected to stick around through the week as colder air moves in, Storm Team 4 says. Temps are expected to fall back into the high 30s Monday, then plunge below freezing Tuesday and hit the 20s on Wednesday.

The storm comes just as the region finishes cleaning up from a Saturday snowfall that dropped 4 inches in Central Park, 6.5 inches on Long Island and caused hundreds of flight delays.