Hah! New undisputable evidence of global warming, errr, climate change!

I wish I had thought of calibrating the temperature probe in ice water. I feel a little em-bare-assed having calibrated at 98.6 deg F doing it the old fashioned way.

The only way the temperature reading will be accurate is if there isn't heat convection (from the road surface on a sunny day, or from the engine when idling).