Richard, can you tell how cold it is by looking at the air?  I read an adventure story from the 50's about a couple spending a winter near the Brooks range.  Claimed they could look out the cabin window (not at the thermometer) and know within a few degrees how cold it was.   
 
You definitely want to keep the fire going in that kind of cold.    Thanks, Brian
		 
		
		
		
		
		
		
		
	 |