The coldest planet in our solar system is Neptune. Although Uranus has a lower average temperature, Neptune's atmospheric conditions, including extreme storms and high-speed winds, create some of the coldest recorded temperatures. The average temperature on Neptune is about -214 degrees Celsius (-353 degrees Fahrenheit). Its thick atmosphere, composed mainly of hydrogen, helium, and methane, contributes to its cold nature. The combination of distance from the Sun and its unique atmospheric dynamics leads to the frigid conditions observed on the planet, making it an interesting subject of study in planetary science.