If my math is right:

0.2 mi * 5280 ft/mi = 1056 ft  x-y distance

332 ft / 1056 ft = 0.314 or 31.4% average grade

0.314 * 90° = 28.25° average drop 

Note how steep it is at about the halfway point!  
Also not shown here is time.  It took about 23 minutes to travel that 0.2 miles...in the dark.

Looking at these two charts is kind of giving me goose bumps remembering back to what it was like to be there. Lets agree to be a little better prepared from now on. I'm still up for hiking in those conditions, but with more food, not going on the day of winter solstice, going into the woods before noon... there are so many ways that we were irresponsible.