So, how cold did it get in New Jersey this morning amid the latest blast of arctic air? One town in Sussex County recorded a bone-chilling morning low temperature of 17 degrees below zero. At least 20 other towns across nine counties also had sub-zero temperatures — not factoring in the wind chill.

The NWS extends a Cold Weather Advisory for the region including parts of Delaware, Maryland, New Jersey, and southeast Pennsylvania.

An unusual weather phenomenon known as thundersnow was reported near Essex County Sunday evening, according to the National Weather Service. The rare weather event was reported around 6:17 p.m.

This new type of weather warning was activated because of the dangerously cold temperatures and wind-chill readings in northeastern Pennsylvania.

“The safety of our plungers is always No. 1 on our minds,” said Jeremy Davis, who helps run the annual Polar Bear Plunge at Seaside Heights for Special Olympics New Jersey. “If it dips below freezing and becomes too dangerous, we would certainly have to make alternate plans.”

A record-breaking snowstorm in the southern U.S. dumped as much as 8 inches of snow on New Orleans and nearly a foot of snow in Alabama

The National Weather Service has issued a hazardous weather outlook for New York and New Jersey on Thursday. Forecasters say there is a chance of afternoon snow showers which could lead to some slippery spots during the evening commute.

By the time March, April, and May come along, even the most ardent snow-lovers can suffer from winter weather fatigue. After all the shoveling and plowing and salting and slipping and sliding and bundling up, the flip from winter to spring is usually a welcome one.

Snowfall is expected to be light and concentrated along the Jersey Shore region. Ocean and Monmouth counties might see up to 1 inch of snow accumulation. Further south, the Cape May County area is expected to receive the most snow, with accumulations possibly topping out around 2 inches.

Multiple places in New Jersey have temperatures well below zero on Tuesday morning at about 7 a.m., according to NJWeather.org, the state climatologist’s office. Among the lowest temps are -14 in Sandyston in Sussex County and -7 in Hackettstown in Warren County.

Temperatures are expected to hit single digits, with wind chills in the negatives, after a Jan. 19 storm dumps snow across much of New Jersey.