What is the estimated average global temperature of Earth when the atmosphere acts as a blanket?

Answer

$15^ ext{o} ext{C}$ ($59^ ext{o} ext{F}$)

The text indicates that on average, the Earth's temperature is about $15^ ext{o} ext{C}$ ($59^ ext{o} ext{F}$) due to the natural greenhouse effect.

What is the estimated average global temperature of Earth when the atmosphere acts as a blanket?
Earthorbitsolar systemlifePosition