Baby It's Cold Outside

I woke up this morning to -1 F. I could tell something was up but it wasn't because I was cold under my cozy blankets. No, it was the light, or rather lack of.  My east bedroom window was much darker than it should be. I opened the blind and found frost on the inside of the window!  I  was reminded that I was missing one storm window. It went missing sometime over the summer. You can see my finger print in the center - me checking there actually was frost on the inside. 

Looks like I need to get onto that task and get a new one made. Here's a picture of where the frost on the window belongs - the outside.