Sounds like a stupidly easy question to find out with a quick internet search, but it's not.
I don't want to know the average surface temperature, or the average ocean surface water temperature, or read another article about climate change.
But that's all I found in the past hour.
I'd like to know the average temperature of all molecules that comprise earth, or a best guess scientific estimate.
I think the median average temperature is around 2,200°C.
The Earth has a radius of 6,371km, giving a volume of 1.08e13km^3.
A sphere of half this volume would have a radius of 5,057km. Within the Earth, this sphere would sit at a depth of 6,371 - 5,057 = 1,314km.
From this chart, the temperature at that depth is around 2,200°C, so half the volume of the Earth has a temperature above that, and half a temperature below it.
