Sure, I use a thermometer under my back. 87 degrees is a normal daytime reading. So I call this "toasty" warm at night. When the under-temperature drops to 80 degrees I begin to feel a cold spot.
I've been doing this awhile to gauge various types of insulation. For example, 1/4 inch thinlinte provides an 18 degree boost in ambient temp. So for me it's good down to about 62 degrees when I start feeling a cold spot. For camping, cold spots are not a big deal so I can go a bit lower. I haven't measured the "shivering" temperature yet
The 20 deg quilt I used last night provided a 40 degree boost in temperature, from 45 ambient, to 85 under by back.
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