New York Today: Get Out the Snow Shovel. Again.

Joshua Bright for The New York Times Today, you may find yourself shoveling. Know the law.

Updated 6:54 a.m.

Good morning. It’s Monday. The Super Bowl’s over.

Guess what? Cold stuff is falling from the sky.

Here’s what you need to know:

- The mix of rain, sleet and snow should change over to all heavy, wet snow by 7 a.m. in the city. Get set for a treacherous commute.

- Four to eight inches is expected before the snow starts to taper off around 2 p.m.

- Public schools in the city are open but all field trips are canceled. Many suburban school districts are closed or closing early. See list.

- Alternate side of the street parking is suspended.

- The commute is getting messy. See “Commute” section below.

- The temperature will hover around freezing most of the day and dip to 20 tonight.

All of this means you may soon get a chance to operate the tool known as a snow shovel.

You may think you know how. But New York City has special shoveling laws.

Q: When do you have to shovel?

A: You must clear your sidewalk within four hours after the snow stops falling. But if it stops after 9 p.m., you have until 11 a.m.

Q: Do I have to clear the whole sidewalk? My sidewalk is very wide!

A: No. You have to clear a path just “wide enough for pedestrians and to allow for wheelchair and stroller access,” the city’s Law Department said.

Q: Can I shovel snow into the street?

A: Please don’t. It can impede the street-clearing process, which is against the law.

Q: How much snow must fall before I’m required to shovel?

A: The law doesn’t say. Use common sense.

Q: I’m just a tenant. Do I have to shovel?

A: Possibly. The law applies to “every owner, lessee, tenant, occupant or other person, having charge of any building or lot of ground in the city.”

Q: What if I don’t shovel at all?

A: You can be fined up to $150 and, theoretically, go to jail for up to 10 days, and that’s just for first offenders.

Also, the city can shovel your walk and bill you for it.

And you may suffer the scorn of your hard-shoveling neighbors.

Here’s what else is happening.

COMMUTE

Subways: Delays on the L and the northbound N. Check latest status.

Buses: N.J. Transit service from Warwick, N.Y., suspended. See updates.

Rails: Scattered delays on New Jersey Transit. Check L.I.R.R., Metro-North or New Jersey Transit status.

Roads: I-95 northbound in the Bronx jammed after accident near Bartow Avenue. Speed limit 45 on the Tappan Zee. Check traffic map or radio report on the 1s or the 8s.

COMING UP TODAY

- A mayoral media blitz: Bill de Blasio is on the Brian Lehrer radio program on WNYC at 11 a.m. …

- … and on TV on “The Daily Show With Jon Stewart” tonight. The mayor tapes at 6:15 p.m. for the 11 p.m. broadcast.

- Scatter roasted soybeans around the lobby of the Kitano hotel on Park Avenue and 38th Street to usher out cold weather - and evil. It’s a Japanese ritual called Setsubun. There will be people in costume. 10 a.m. [Free]

- Free Bloody Marys promote Tabasco sauce at Pennsylvania 6 restaurant on West 31st Street. 10 a.m. to noon.

- Y’all come back soon: Senator Charles E. Schumer urges the N.F.L. to bring the Super Bowl to the New York area again. Outside the Sheraton Hotel in Midtown at 11 a.m.

- The 1957 Skid Row semidocumentary “On the Bowery” screens at the Library for the Performing Arts at Lincoln Center. 2:30 p.m. [Free]

- About 200 college students give DNA samples at the American Museum of Natural History at 5:30 p.m. In April, scientists will tell them about their ancient ancestors.

- Hilton Als and Carla Kaplan talk about their respective books, “Miss Anne in Harlem: The White Women of the Black Renaissance” and “White Girls,” at the main New York Public Library. 7 p.m. [Free]

- Telling a different kind of story: Community Education night for the popular Moth storytelling series features high-school students and a stroke survivor with impaired speech. At Housing Works in SoHo. 7 p.m. [$5 suggested]

- New York’s poet laureate, Marie Howe, reads at the Stella Adler acting studio on West 27th Street. 7 p.m. [Free]

- Claire Messud talks about her new novel, “The Woman Upstairs,” at Powerhouse Arena in Dumbo. 7 p.m. [Free, R.S.V.P.]

- A pansexual cabaret pays tribute to the 1940s researcher George W. Henry, author of the 1941 deviancy study “Sex Variants.” At Joe’s Pub, 9:30 p.m. [$15]

- For more events, see The New York Times Arts & Entertainment guide.

IN THE NEWS

- Philip Seymour Hoffman was found dead of an apparent overdose at his apartment in Greenwich Village. [New York Times]

- More than 27,000 Super Bowl fans followed recommendations to take the train to the game â€" and waited hours at a jammed station for trains home. [Associated Press]

- Mayor de Blasio dropped the groundhog. Both survived the ordeal. [New York Times]

AND FINALLY…

Fifty years ago today, nearly half of the city’s public school students skipped school.

It was not a snowy day.

It was a civil rights boycott led by black and Puerto Rican students, protesting the city’s integration plan, which they called inadequate.

Protesters of all races marched at 300 public schools. Nearly half a million children were absent.

About 3,500 demonstrators, mostly children, marched to the Board of Education â€" peacefully.

They chanted “Jim Crow must go” and sang “We Shall Overcome.”

The civil rights leader Bayard Rustin, who had directed the previous year’s march on Washington, said it was the biggest civil rights protest in the nation’s history.

Joseph Burgess contributed reporting.

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