How cold can it get in Park City?

Always a hard question to answer. I remember that years ago, at the end of January 1989, we hit -39 F or something like this. Boy was it cold!

This week looks like it will be arctic too. Yesterday was -14 and today is – 11 with very little relief in sight. Then my wife asked me, how cold was it last winter? I've kept tab of weather and temperatures since 2006, so I look it up and said that it went down to -16 last January, and then began reciting the stats for the other years.

If I didn't write it down, how would I be able to tell. I have yet to find a repository of temperature history on the net...