They range from from 90 degrees Kelvin to 700 degrees Kelvin. The temperature on Venus is a little hotter but more stable. It exhibits no plate tectonics but on the other hand, Mercury is much denser than the moon. Mercury is the second densest major body in the solar system after Earth. This indicates that Mercury's iron core is larger than the Earth's, probably comprising the majority of the planet.
Mercury therefore has only a relatively thin silicate mantle and crust.
Mercury's interior is dominated by a large iron core which radius is 1800 kilometers to 1900 kilometers thick. The silicate out shell is only 500 to 600 kilometers thick, but some of the core is probably molten. Some cut through the rings of craters and other features are shown in ways which seem like they were formed by some sort of compression. It is estimated the the surface of Mercury has shrunk about one kilometer in the planets radius. One of the largest features on Mercury's surface is the Caloris Basin which thought to be similar to the large basins or maria on the moon.