I would have to say it was around 20 F during an overnighter about a month ago.  I have a bird feeder on the other side of my deck.  When I got up the next mornig I had some little birds setting on the camping table I put next to the smoker. They were getting seed from the feeder and eating it on the table next to the warm somker,
				
			
	
	
			
			
			
			
			
			
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