Get ready to break out those parkas.

Temperatures in the Big Apple are expected to dip this week, bringing a bone-chilling cold front and the possibility of a light snowfall Thursday night into Friday, the latest forecasts show.

“It’s going to be a dramatic change,” AccuWeather senior meteorologist Paul Walker told The Post Monday, adding that there will be a 20-degree drop in daytime highs throughout the week and “nighttime lows are going to be a lot colder.”

Walker noted, “Thursday night is when the real cold” is predicted to strike the northeast, as a high-pressure storm system moves in from western Canada.

Meteorologists predict a high of 54 degrees for Thursday and a low of 34 with a chance of snow by the nighttime.

“There is a possibility that we could see a rain mixed in with some snow Thursday night as the front comes through,” Walker said.

Meanwhile, forecasts show rain for Tuesday, with a high of 60 degrees and a low of 41, and sunny skies on Wednesday, with a high of 53 degrees and a low of 43.

A high temperature of 42 degrees is predicted for Friday with partly sunny skies, but by Friday night, the mercury is expected to plunge to below-freezing temps, with a low of 30.

Forecasts for Saturday are similar, with sunny skies, an expected high of 40 degrees and a low of 28.

“The coldest of the air with be Friday night and Saturday night,” Walker said, adding that for this time of year, “it certainly is colder than normal.”

The normal high for when the storm is expected roll in is 56 degrees, with a low of 44, Walker said.

Partly sunny skies are predicted for Sunday, but temps will only reach a high of 47 degrees and a low of 38.