I don't know why this question is trending on Web. But, I don't have clear Idea on how to answer this question exactly. You can post your answer below. I am just posting my thoughts over here.
As we go down to below the Earth surface, the temperature will decrease at starting but after certain distance below the surface of earth it will start increasing up as we head to the Earth's core. This is because of the extreme hotness of the Earth's core.
Well, I can't tell the exact temperature of 200 km under the Earth because for this I have to go there with a thermometer and I can't do that. If you have any idea on how to determine the temperature below the Earth surface please let me know below.
Cheers!