In the midst of the season’s worst winter storm, a hail of bullets also rained down on the Big Apple — as two people were fatally shot and four others wounded in separate incidents across three boroughs, police said.

Four of the six victims were hit in The Bronx, including a 20-year-old man killed at a baby shower in Morrisania yesterday by what appeared to be a trio of attackers who were caught on surveillance footage.

The victim was shot in the upper back, chest and arm. His cousin, 22, was listed as being in critical condition last night after taking a bullet in the stomach at the same party. Both young men were from Brooklyn, police said.

A super at the East 165th Street building told The Post that the surveillance video showed one man standing watch at the front door and two approaching the party room — with one handing the other a gun along the way.

Meanwhile, in Brooklyn, a pizza run turned deadly for a 19-year-old man shot at a Clarkson Avenue deli, police said.

He and a friend had just picked up a pie and gone into the One Star Deli to buy some soda yesterday when shots rang out.

The 19-year-old victim, shot twice, died at Kings County Hospital, police said.

Neighbors appeared stunned that the storm, which dropped roughly a foot of snow in the city, somehow failed to chill the trigger happy.

“It’s surprising,” said Mary Simon, 22. “What’s somebody doing out in the snow — especially if that’s why they’re out there?”

A liquor-store owner on Clarkson Avenue called the violence in his neighborhood an eye opener.

“Nobody expects anything like that to happen in the storm — maybe in the summer, but not in a big storm,” said Bert Williams, 74, owner of Bamboo Liquors.

Back in The Bronx, a man was shot in the shoulder on 169th Street just before midnight Friday and another in the leg shortly after 1 a.m.

There had been no arrest in either of those cases as of last night.

Another man was shot in the leg on Amsterdam Avenue in Harlem at about 12:30 a.m., and a 15-year-old boy was charged with assault and weapon possession in connection with that shooting, cops said.