A teen boy fell through thin ice on a Central Park lake on Monday — the third time since last month that someone has plunged into the frigid waters.

The 16-year-old boy tumbled after the frozen surface gave way on Swan Lake near 61st St. and Center Dr. at 1:15 p.m., police said.

Two nearby NYPD counterterrorism officers — Edward Radoncic and Anthony Dispigna — rushed over. Radoncic ventured onto the ice and dragged the shivering teen out to safety. The boy was taken to Weill Cornell Medical Center and is expected to be fine.

“Had it not been for these officers here right now, the results could have been very, very tragic,” NYPD Counterterrorism Chief James Waters told reporters.

Radoncic recalled ripping off his gun belt and heading out onto the ice — which was getting thinner by the minute as temperatures rose into the mid-40s.

“I figure if I go down by myself and pull him out we have a better chance than all of us being on the ice,” he said at a press conference. “And it worked in our favor.”

Dispigna, who helped pull the teen to shore, at one point had to be saved from the icy waters himself.

Screengrab from a video shows a cop using a ladder to rescue a 16-year-old boy who fell through the ice at Swan Lake in Central Park on Monday.

(NYPD)

“My foot sunk through the ice, but luckily the rest of our team was there and I could feel them pulling me back, so I was totally confident in them being able to help me out and help us out,” he said.

The dramatic rescue came a day after two other boys fell into the same lake while trying to snap a selfie. On Sunday, the pair, 13 and 15, were able to swim ashore after falling into the pond.

Cops later caught up with the teens at W. 60th St. and the West Drive. They were taken to St. Luke’s Hospital for observation.

Last month, a group of teens, all 15 and 16 years old, plunged through the ice in the same lake. They had also been trying to take a group selfie, officials said.

Three good Samaritans jumped into the water to help the teens.

In response to the incidents, the city Parks Department said Monday that it would increase its number of uniformed workers around the pond, which is already surrounded by bright green bilingual signs warning people not to go out onto the ice.

An NYPD counterterrorism officer rescues a 16-year-old boy who fell through the ice at Swan Lake in Central Park on Monday.

(NYPD)

“We take these incidents seriously and are investigating new methods to prevent people from going out on dangerous frozen ponds,” the department said in a statement. “In the meantime, Parks will increase its uniformed presence at the pond to deter visitors from such activities.”

The agency offered these water safety tips:

– Ponds and lakes may appear frozen, but venturing onto them is extremely dangerous and can cause potentially fatal accidents.

– Ice must be at least 6 inches thick before it can maintain the weight of a person, and to freeze to the right thickness, the temperature must be well below freezing for weeks.

– Determining the strength of ice is extremely difficult, especially for the untrained.

– NYC Parks posts warning signs along the perimeter of the city’s lakes and ponds.

– Special ladders are also installed around the edges for trained personnel to use in the event of an emergency.