While overall city crime continues to slide to a new low, there has been a double-digit spike in reported rapes in the past two months compared to the same period last year – possibly because of a so-called Weinstein Effect, authorities said Monday.

“We do see that [the reporting increase is] coinciding at the same time we have a lot of media coverage. We continue to see a lot of [older] rapes that are being reported,” said Dermot Shea, the NYPD’s chief of crime-control strategies, after months of sex-harass cases involving everyone from movie producer Harvey Weinstein to actor Kevin Spacey to Alabama GOP Senate hopeful Roy Moore.

It is “very difficult to say the role that plays in it,” but, “it would be difficult to ignore what’s been going on in the media the past couple of months,” he said.

Reported rapes were up 15.6 percent last month compared to November 2016, or 111 vs. 96, the NYPD said. Rape reports also were up by double digits this past October compared to the same time last year, they said.

Still, despite the surge in the past two months, rapes overall are down year-to-date in the city by 2 percent, officials said. Shea added that there also has been “a very significant increase in our rape arrests” in the past few months, although he did not provide numbers for either.

Of the 2017 cases, 285 involved “old” rape allegations, authorities said. That is 30 more than in 2016 for the same period.

“It’s a time in history many, many women have decided to no longer remain silent,” said Mayor de Blasio, who was at the presser, which was being held to go over the NYPD’s latest crime statistics.

Police officials and the mayor encouraged rape victims to continue to come forward.

“If the perpetrator is not reported, then they could strike again….Reporting gives the NYPD the chance to stop the problem and to bring justice,” the mayor said.

NYPD Chief of Detectives Robert Boyce said: “We’re seeing people coming forward and having faith in the NYPD — and that’s what we want to see.”

“Whether they think they can finally get resolution now — I hope that’s the case.”

Out of the 111 rapes this month, 21 of the accused rapists were a boyfriend of the victim, nine were family members, 21 were men who had “consensual” sex with minors, and nine were strangers, officials said. The rest were people “known” to the victim.

Shea pointed to a “definite link” between some of the rape numbers reported and human trafficking.

“It is almost on as weekly basis, and it doesn’t always make the news, but on a weekly basis, it seems that we are rescuing a girl out of either a motel, out of an apartment somewhere in New York City,” Shea said. “They think they’re going to go meet some friends and have a good time and next thing they know they’re trapped in an apartment.”

Meanwhile, police officials noted Monday that as of Nov. 30, there were 52 non-consecutive days this year without a shooting.

“For those of us who have been around a while, that number is incredible,” Shea said.

According to the NYPD, last month compared to November 2016 showed there were four fewer murders, 17 fewer shooting incidents and 656 fewer index crimes.

Nov. 2017 compared to Nov. 2016 also showed:

Robberies: 1,172 vs. 1,289 – a 9.1 percent drop.

Felonious assaults: 1,407 vs. 1,611, a reduction of 12.7 percent.

Burglaries: 1,016 vs. 1,09 – a decrease of 6.9 percent.

Grand larcenies: 3,617 vs. 3,824, down 5.4 percent.

Grand-theft auto: 480 vs. 543 – an 11.6 percent drop.

There were 232 crimes reported in the Transit Bureau in November compared with 216 in Novemeber 2016, an increase of 9.4 percent.

Crimes in the Housing Bureau were down by 14.9 percent.