So, I'm a new to backpacking and am looking at my first "real" sleeping bag.  My ultimate goal is to through hike the AT, but that won't be for about 9 years (saving, getting affairs in order, etc.) but I'm doing smaller day hikes and short trips between now and then to get ready.  Right now, I'm doing about 10 to 15 miles per week +/- consistently and am looking for some 1 to 2 night trips.  I'm in Georgia and these will be trails I can easily drive to.  


So, with all of that put of the way, I've been looking at sleeping bags and like the Nemo Tempo.  They are iny price range and I like the spoon shape.  My question though is should I go with the Tempo 20 or Tempo 35?  I'm a cool sleeper and most of my trips shouldn't dip much below 30.  I'm really leaning toward the 20, just wanting to make sure I'm not missing something.


Thank you all for an awesome community!

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