The ice sculptures in Boston’s Copley Square were in no danger of melting, thanks to the continuing arctic blast.

Temperatures in Boston peaked Sunday at 13 degrees around 3 p.m., according to the National Weather Service.

The first few days of 2018 are expected to have “dangerously low wind-chill values,’’ forecasters said. Temperatures may not rise above single digits Monday and may only reach 15 degrees Tuesday.

“With the current forecast, it looks like we could tie the record for most consecutive days with max temps being 20°F or less in Boston, MA! This record is exactly a century old,’’ the weather service tweeted out Sunday.

A winter chill advisory has been in effect since 8 p.m. Saturday and was expected to remain until noon on Monday, forecasters said.

What’s more, meteorologists said that they are keeping an eye on “a significant coastal storm [that] may bring accumulating snow’’ from Wednesday night into Thursday night, potentially followed by another bitterly cold blast on Friday.

Every night during the current cold snap, the Pine Street Inn in Boston’s South End has had between 70 and 100 more people seeking refuge than the homeless shelter has beds, said spokeswoman Barbara Trevisan.

“We always prepare for winter, but with all the extra demand on staffing, food, resources, it definitely does wear on staff,’’ Trevisan said in a phone interview.

The cold has brought a bump of 25 to 35 percent in staffing as the shelter remains open 24 hours a day, she said.

“It’s all hands on deck right now,’’ Trevisan said. “It’s really brutal out there.’’

Although the shelter has not seen any cases of hypothermia this year, she said they are worried for the city’s homeless.

“Every day we just hope everyone makes it through the night,’’ Trevisan said.

The First Night crowd was sparse atCity Hall Plaza on Sunday,the last day for the holiday market, Boston Winter, where roughly 80 vendors sold scarves, dog treats, jewelry, and gifts out of small chalets.

“We are closed due [to] extreme temperatures,’’ read a handmade sign posted on the outside of one shopping stand.

The vast majority of stands closed their doors early — and those shopkeeperswho chose to tough it outsaid they weren’t sure it was worth it.

“I don’t know that anyone should be outside at all,’’ said Jen Bennett Gubicza, from inside her “Little Shop of Cute’’ stand. “I’m actually glad that no one is out,’’ she said, even though she said it hurt her last potential day of business.

Despite the stagnant end to the season, Gubicza said that she plans on renting a chalet in the market again next year.

“I think Boston needs a winter market,’’ she said.

Around mid-afternoon, with only five hours left before the shops officially closed for the year, vendors pulled carts of merchandise and packing materials toward vans parked on the outskirts of the salt-bleached brick plaza.

Less than a dozen potential shoppers walked the rows of shops, heads down and scarves pulled over their faces.

Some children and couples skated around the ice track on the far side of the plaza as the wind threatened to knock them off balance.

Mauricio Angelone, Daniel Akikie, and Cody Hale huddled in the skating rental chalet.

They could only stay out on the ice loopfor five to ten minutes at a time, they said.

The men said that they were going to try and manage another few rounds before seeking shelter. When asked if they planned to attend any of the First Night activities later that night, Angelone quickly responded, “Nothing outside!’’

Globe correspondent Lucas Phillips contributed to this report. Contact Kilgannon at maddie.kilgannon@globe.com.