There's a webcam on the top of Sulphur Mountain in Banff. It's an HD webcam - the first I've seen - and it's running 24/7/365. I've been running a script to grab every image for the last week (they only update every 5 minutes, so it's not that much data), and I periodically convert the stills into a timelapse movie.
I just took a look at the timelapse for November 29, which was a pretty nice day here in Calgary. Turns out it was nice and clear in Banff as well. One thing that keeps surprising me (even though I've lived here all my life) is just how much darkness we get. I've trimmed the timelapse to just contain daylight hours, since well over half of the movie would have been black. Come ON Dec. 21...
Banff Sulphur Mountain Webcam Still
I'll process and post a week's worth (or so) when I get the chance. The hardest part of the process is removing frames that get corrupted on download, as they bork the conversion process.