Southern Alberta and much of the prairies, experiencing abnormally warm weather for time of year, are likely in for a cold snap just in time for Christmas.
Enjoy the abnormally warm mid-December temperatures we've been having because it looks like winter conditions may be here just in time for Christmas. Southern Alberta has been basking in record warmth for the past two weeks, in many cases 8 to 14 degrees above average for this time of year. However long range forecast models are indicating we'll start to see a drop in temperatures by the middle of next week and lasting right through the holidays. In fact, the forecast is showing we will likely see arctic air moving in before Christmas Eve, plunging daytime temperatures into the low minus teens and overnight lows possibly near or colder than -20 by Boxing Day. There is a chance we could see a bit of snow with the much colder temperatures as well leading up to Christmas Day. - Pat Siedlecki
The map below (credit to The Weather Network) showing deep blue in southern Alberta, indicates quite cold temperatures for the final week of December 2017