Back-to-back snowstorms are set to wallop the Big Apple on Thursday and Saturday evenings — and the icing on top will be Sunday’s wind chills of as low as minus-20 degrees.

One to 3 inches of snow will blanket the city overnight Thursday, making for a slippery Friday morning commute, meteorologists warned.

Then, Saturday night, the “big storm” will hit, said AccuWeather meteorologist John Feerick. “That will produce a lot of heavy snow.”

Forecasters aren’t sure how long the flakes will fall before turning to freezing rain Sunday. Depending on that, the city could get anywhere from 3 to 7 inches.

During the Nov. 15 storm, snow fell for longer than was anticipated, dumping 6 inches and paralyzing the city. The metro region wasn’t prepared, and commutes soon turned hellish.

This time around, the city’s Office of Emergency Management said it’s keeping a close eye on the storms.

“One of the things that we’re enhancing is we’re monitoring earlier,” OEM spokesman Omar Bourne told The Post.

The office is keeping in close touch with the National Weather Service and the departments of Sanitation and Transportation, Bourne said.

“I hope they are on the ball,” Steve Potanobic, who works in computers, told The Post. “It seemed like last time, a lot of trains stopped and people could not get home.”

Winds will be so brutal Sunday night and into Monday, that it will feel like between minus-17 and minus-20 degrees.

Additional reporting by Princess Jones