A huge mob of rowdy winter warriors descended on a Manhattan park on Monday afternoon — throwing snowballs in a chaotic scene and tormenting cops, according to authorities and witnesses.

The snow day revelry inside Washington Square Park got out of hand shortly after 4 p.m. and police were called to respond to the ruckus, according to the NYPD.

Cops found a large group throwing snowballs and observed pure pandemonium as hundreds of people launched frozen projectiles at each other and oncoming traffic, according to police and witnessed by The Post.

“The New York City blizzard snowball fight has happened. It was complete pandemonium,” said a man who showed up for the fight.