My Pleasure JB,
I was wrong about the coldest temps for the grey cups however, according to this 2001 piece on Flutie when he was up here, it gets a lot colder ( Gee I need a trip somewhere warm ). Anyways, here is a piece from the article and Cheers.
No, they don't know the half of it. They don't know the bitter-cold temperatures Flutie used to see in Canada, when he was regularly winning Grey Cups in the CFL. "My coldest game up there? It was minus-24 at kickoff, minus-44 by the end of the game, minus-85 wind chill. With six inches of snow, and 35-mile-an-hour winds.
"I had 200 yards passing at halftime. But in the second half, the heaters broke. Well, they didn't actually break. They turned the heaters off at halftime, because they took an extended halftime to plow the field, and the propane thickened up, and wouldn't go through the heaters, so they shut down. And we were a passing team ... By the end of the game, people couldn't run."