If you stood at the equator on Mars, the temperature would be 21C at your feet, where the Sun had warmed the ground, but 0C at the top of your head due to the lack of atmosphere
Really?
How are the temperatures being measured?
Are both of the thermometers in the shade?
Are both thermometers in the atmosphere?
Are both thermometers of the same type?
What about night time when the temperature is about -70C is there a temperature difference then?