I fly for an airline based in western canada and temp corrections are standard approach briefing requirements (actually on checklist year round to jog your memory for when the temp does go to the minus side). No matter where you fly temp can have a drastic effect on your true alt and as deadly as a mis-set altimeter descending from transition.Our company has had jeppeson produce quik ref charts for diff temps and step down alts for all our mountainous terrain app's which we all use and appreciate.