​​​​​​Good point about radiant heat from the pavement. Not sure where else it could go for a "clean" reading. I'm assuming the bottom of my saddle is going to let plenty of body heat through.

Edge units have a thermometer in them. Anything with a barometer does, you need to know the temperature of the air you're measuring to determine altitude from pressure. But the Edge ones tend to go out in front of the bars and measure from the bottom, so they give you a pretty good reading and there's no reason to use a Tempe with them. I don't think Strava keeps the data but you'll see it in Connect.