We've definitely seen this song and dance before. Northern air is billowing in from the exit region of a high pressure air mass, which is cascading a chilly pool of air over southern Alberta. Thankfully, westerly wind is once again on the way, also - the next song, the next dance. That means positive temperatures, and in fact, temperatures that hover around or above seasonal through the work week.
Monday: Mainly sunny, high 5 Tuesday: Mainly cloudy, chance of showers, high 4 Wednesday: Mainly sunny, high 7 Thursday: Partly cloudy, high 3 Friday: Mainly cloudy, high 9