The moon experiences temperatures both hotter and colder than those on Earth. When the Sun is directly over-head, the temperature on the Moon’s surface is higher than the boiling point of water — 100°C (212°F). However, at night, the Moon becomes very cold, with temperatures dropping to —173°C (-280°F). Earth and the Moon are approximately the same distance from the Sun, and therefore receive the same amount of heat. But the lack of an atmosphere on the Moon means that its temperature range is much more extreme. The Sun’s radiation is not filtered out by gases in the atmosphere, and there are no clouds to stop heat escaping at night.
The moon rotates on its axis in about 27 days. Daytime on one side of the moon lasts about 13 and half days, followed by 13 and a half nights of darkness. When sunlight hits the moon’s surface, the temperature can reach 260 degrees Fahrenheit (127 degrees Celsius). When the sun goes down, temperatures can dip to minus 280 f (minus 173 c). Temperatures change all across the moon, as both the near and far side experience sunlight every lunar year, or terrestrial month, due to lunar rotation.
The moon tilts on its axis about 1.54 degrees — much less than Earth’s 23.44 degrees. This means the moon does not have seasons like Earth does. However, because of the tilt, there are places at the lunar poles that never see daylight.
The Diviner instrument on NASA’s Lunar Reconnaissance Orbiter measured temperatures of minus 396 F (minus 238 C) in craters at the southern pole and minus 413 F (minus 247 C) in a crater at the northern pole.
“These super-cold brightness temperatures are, to our knowledge, among the lowest that have been measured anywhere in the solar system, including the surface of Pluto,” David Paige, Diviner’s principal investigator and a UCLA professor of planetary science, said in a 2009 statement. Since then, NASA’s New Horizons mission set Pluto’s temperature range at a comparable minus 400 to minus 360 F (minus 240 to minus 217 C).
Scientists suspected that water ice could exist in the moon’s dark craters that are in permanent shadow. In 2010, a NASA radar aboard India’s Chandrayaan-1 spacecraft detected water ice in more than 40 small craters at the moon’s North Pole. They hypothesized that over 1.3 trillion lbs. of water ice hid among the permanently darkened craters.