I'm about the same. But, if I was going on a 30 day long trip to a place where I could not get out quickly and easily, down here in MS( that will never happen, and there really is no such place anywhere near here), I still can't imagine me preparing for minus 20F, which is what I would have to do to cover anything that has happened in the last 60 years. But who knows, if the weather was at risk for being really crappy, maybe I would prepare for zero. Or at least prepare to reasonably get by at zero, and to be plenty warm and snug at 10-20F. In my 14 years of hanging, the most severe I have managed to hang in down here is 6F on ONE night, plus a few more 10F nights plus some wind chill. I was plenty warm on all of them, with a variety of insulation types.
OTOH, on an HF group back pack hang in Feb 2009 down here, I woke up about 0200 to pee, then realizing I was just a bit chilled all over. It only got to a low of 27F, and I had a highly rated 0ºF UQ snugged up under me, which had previously kept me toasty at 10F. But we had hiked through cold, windy rain storms to get there, and then it was blowing rain turning to blowing snow that night. Fortunately, I had a thick removable sleeping bag hood in my pack, and once I put that over the fleece cap and jacket hood I was already using, I ended up with another toasty night.
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