(Bloomberg) -- We all got used to it: a warm December from Chicago to New York and even on up into Boston.

Flowers blooming, birds singing — it could have been the start of spring. And then, slap! Temperatures fell into the teens on the Fahrenheit scale in Manhattan’s Central Park and elsewhere around the Northeast. That’s negative territory on the Celsius scale. Ice started to form on puddles and ponds and a little snow fell here and there.

“It’s a period of back to normal,” said Brian Hurley, a senior branch forecaster at the U.S. Weather Prediction Center in College Park, Maryland.

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