> "The standard measuring conditions for temperature are in the air, 1.5 metres (5 ft) above the ground, and shielded from direct sunlight intensity" [1] And t

> "The standard measuring conditions for temperature are in the air, 1.5 metres (5 ft) above the ground, and shielded from direct sunlight intensity" [1] And they use enclosure like this to do that: https://en.wikipedia.org/wiki/Stevenson_screen https://en.wikipedia.org/wiki/Stevenson_screen > If you're standing on dark surface in a hot place, the air temperature can be much higher. "In recent years a ground temperature of 84 °C (183.2 °F) has been recorded in Port Sudan, Sudan." I have a outdoor temperature sensor in one of those enclosures and one in my attic. On sunny days, the attic regularly reaches 140+ °F and is maybe 50+ °F hotter than the outside air. I'm sure if I put the sensor directly on the roof, it'd closer to the attic temp than the outdoor temp.