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The r rating is very low, this would be a summer only pad.
Supplement it with a closed cell foam mat in cold temps. For very cold temps you may need something else, but a 10mm CCF with this should be good down to -5C or even lower.
This is what I do. For colder temps, I bring the foam pad and place it underneath. As a Californian, I rarely need the foam pad, except during the winter or at high elevation.