Certainly when you are in very cold weather (and I recall that Montreal winters are brutally cold), you seem much more alert, keyed up. It's almost shocking when you first encounter really cold temperatures.
Ha! In my western winter days -15 to -20 is just cold enough to keep the tourists off the slopes and allow us locals to spend much less time in lineups. -25 was perfect for those high speed full tuck runs.
-45 is Brutally cold.