If I could find a reasonably small min/max thermometer, I'd carry it. I'm very interested in matching gear to temperatures, but often sleep through the cold part of the night, so don't know how cold it got. Is there such a thing as a "small" min/max thermometer?
Alternately, is this a function on a high-tec watch?
Smallest I could find, but they appear to be designed for immersion of the probe: