Neptunes+Atmosphere

neptunes atmosphere is surrounded by shroud of cold cloud neptune is the coldest planet out of the solar system. neptunes atmosphere is mostly hydrogen Much of what we know about Neptune's atmosphere is from the Voyager II flyby in 1989. Like Uranus, Neptune has a dynamic atmosphere with a shroud of cold clouds. The average cloud temperature ranges from about -240 degrees to -330 degrees F. The air also made of complex molocules called methane.