The Solar System

What is the temperature like on Mercury?
Answered by Science Channel
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    Science Channel

  1. Mercury has practically no atmosphere of its own as it is so small in size and so close to the sun that its gravitational field is too weak to hold on to gases. Mercury's temperature, therefore, is determined almost entirely by the sun. During the day, temperatures climb as high as 840 degrees Fahrenheit (450 degrees Celsius) -- so hot that they are capable of melting tin and lead. At night, the temperature can be as cold as -275 degrees Fahrenheit (-170 degrees Celsius). Mercury, therefore, has the most radical temperature changes of any planet.

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