Cloud temperatures on Neptune range from around minus 240 degrees Fahrenheit to minus 330 degrees Fahrenheit. The dense, extremely cold atmosphere on Neptune averages minus 373 degrees Fahrenheit.
Neptune's atmosphere is made up of a cloak of cold clouds that consist of about 80 percent hydrogen, 18.5 percent helium and 1.5 percent methane.
Neptune is subjected to constant weather changes and has high-altitude clouds that consist of methane ice crystals. These massive clouds resemble cyclonic storms and are constantly circling the planet at speeds as high as 1,200 miles per hour. The severe wind speeds and dynamic atmosphere on Neptune are greatly influenced by its massive internal heat source. Neptune is a gas giant, is the eighth planet in the solar system, and has 13 known moons as of 2015.