I went to the Heritage Classic game on Feb. 20th with my son. It was about -25 C (about -12 F) which isn't toooo bad but there was a wind which makes it way colder.
The video was just before the game. They showed interviews with players on the big screen and then had a lot of fireworks and music as the players skated onto the ice.
It was chilly but a lot of fun.
https://www.hockeycoachingabcs.com/videos/watch/heritage-classic-outdoor-game-2011/
"it's the cursed cold and it's got right hold till I'm chilled clean through to the bone;… yet ain't being dead tis my awful dread of the icy grave that pains, so I want you to swear, that foul or fair, you'll cremate my last remains."
Sam Magee
'The Game is the Greatest Coach'
'Enjoy the Game'