The effects of sub zero temperature

Look closely.  This was my Dad's mercury thermometer that shows the high and the low of any day you happen to re-set it.  Concentrate of the left side, the bottom of the blue max bar indicator shows -4, the current picture taking event at about 30.
On the right side, I haven't re-set since the summer showing the max temperature at about 84.

The minus degree temperatures does some crazy stuff with the river.  The river freezes from the bottom up - called Anchor Ice.  The above short 2 second video shows the Frying Pan River actually flowing back up hill to avoid the growing ice from the bottom up, and if you watch closely, the ice has actually formed a mini waterfall on the upper right.