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As public-school parents around the city waited on tenterhooks, Mayor Bill de Blasio finally informed families in a tweet Sunday that in-person classes would go ahead Monday.

In announcing his decision, Hizzoner noted the city’s latest seven-day average positive-test rate, 2.57 percent, which was slightly lower than Saturday’s reported 2.69 percent and Friday’s 2.83 percent.

The mayor has said that if the rolling rate hits 3 percent, city school buildings will close.

Parents told The Post on Sunday that the uncertainty of not knowing from day to day whether their kids would be in the classroom was driving them crazy.

“Oh my God, it’s killing me. It’s so stressful. Every day I wake up thinking, ‘Is this it? Have things gotten so bad already that we’re back to where we were last year?’ ” said parent Jessica Alfaro, referring to when city schools went all online in April around the height of the pandemic.

Alfaro, 27, has a daughter in first grade at PS 62 in Richmond Hill, Queens, and chose the hybrid option for her, meaning the little girl now receives some in-school instruction as opposed to all online learning.

“The public school system this year has been far from perfect,’’ the mom said.

“But at least my daughter gets some days of interaction with kids and some one-on-one learning with her teachers.

“For her and for so many kids, remote learning is no substitute. If [the schools] close, she’s going to be very upset. I’m going to be even more upset.”

Sheleza Mohamed, 30 — who has a son Kevin, 9, in fourth grade at PS 55 in South Richmond Hill, Queens — said, “It’s very stressful, the not knowing’’ day to day.

“But the question really isn’t ‘if’ but ‘when’ ” schools will shut down again, the parent said.

“It’s only November, and the [infection] average is just below 3 percent,’’ Mohamed said. “How’s it not going to reach 3 percent? Maybe it will happen this week, maybe it will happen next week, but it’s going to happen.”

And when it does, “it’s going to be devastating for my son . . . He hated the remote learning, which was why we were so happy that the schools offered a part-time in-person option.

“So I’m just trying to prepare him now … [telling him], ‘Kevin, there’s a good chance pretty soon we’re going to have to go back to Zoom full-time.’ He’s upset to hear it, but at least he’s prepared.”

City public schools went hybrid to include some in-person learning last month.

At the beginning of the school year, parents had the option of whether to send their kids to school or keep them all online — and more than half chose the remote-only option.

Monday is the deadline to make the switch either way.

Both Alfaro and Mohamed said they are sticking with the hybrid option for their children.